If you are interested in starting a culture from scratch here are a few favorite links:
One of my biggest mistakes is that I thought I could make bread straight away after making a culture. It actually took me more than a month of steady feedings to get my culture strong enough to raise bread dough. Now that my starter is mature and fed regularly, I can have bread in just under 24 hours. It may seem like work, but really it's not. I like to think of my starter as a draft horse (I like to think of a draft horse as a giant cat): just a little bit of care, and it works hard for you while you are off doing something else.
Feeding a StarterFrom what I have read in numerous sources (and now it's firmly cataloged in my mental warehouse, so no specific siting here...) you can approach feeding starter one of two ways. If you are a frequent baker, you can keep it out at room temp and feed it one to three times a day. If you are an infrequent baker, you can feed it once every two or three weeks (or sometimes longer) and store it in the fridge. I haven't yet stored my starter in the fridge, and since I do bake a lot, I do just fine keeping it in a glass quart-sized bowl on my counter. Cold storage is said to make a starter taste more "sour"; breads that have a proofing under refrigeration are said to have a more pronounced tang as well. I have noticed this with doughs that I have refrigerated prior to baking.
I feed my starter every morning around breakfast time, which not only is a good time for me to remember, but also is optimum for when I usually mix up bread. Starter is most active 4-6 hours after feeding, so if I feed at breakfast and mix up dough after lunch ,I can have new bread by the noon the next day (usually). Now, if I was feeding my starter more often, I think it may be a bit more active and work a bit faster - but for now I enjoy waiting on it.
I feed my starter equal portions by weight of plain all-purpose white flour and water. I am a geek, and I do weigh my starter's breakfast. Plenty of people do not have a scale, and do just fine eyeballing it. When a starter is equal parts water and flour by weight, it is considered 100% hydration starter, and it's about the consistency of pancake batter. Many sources will tell you never to touch the starter with metal utensils, but I have always used a stainless steel spoon to stir it up, and I have never contaminated it. (I wouldn't use copper or any other base metals, however.)
Technically, I should feed my starter half of it's weight. For example, if I start the morning with 200 g. of starter, I should be feeding it 50 g.
each flour and water. I don't do this. (However, I may soon start being a bit more official to see if I have better activity.) I usually feed either 50 g. each or 100 g. each flour and water depending on the volume of the starter in my bowl. Since my starter is well-established, it seems to be active and bubbly on this schedule - and if I ever feel it is a bit sluggish, I slip it some rye flour since that contains a bit more naturally occurring wild yeast. I have also been known to feed it a little before bedtime if I want it to become more active. I always think of Nancy Silverton saying that humans could survive on 1 meal a day, but it's not advisable - neither is it advisable to feed a starter less than three times a day. But since I am not running a production bakery over here, despite what you have heard or may suspect, I have been having good luck so far.
If I was being official and dumping off all but 100 or 200 g. of starter every morning, I would have more starter to play around with, or wash down the drain. This elimination seems wasteful, but really, it's like any living thing... the body absorbs what it can use and discards the rest. And, luckily for experimental kitchen types like myself, discarded starter can be turned into wonderfully delicious things. I haven't actually ditched any starter in quite a while that hasn't been turned into something else - another reason I'm happy with my current feeding regimen.
Other than bread I've made English muffins, chocolate cakes, pretzels, pizza doughs/flatbreads, muffins, banana bread, pancakes, waffles, and probably a few other things I'm forgetting. All of the above I believe are healthier than their non-cultured counterparts, and even if they aren't, they are tastier to be sure. I've re-vamped the "Recipes" tab at the top of the page to include all the sourdough recipes I've posted about in one place. I'm sure that this will be a growing category.
If you are looking to experiment with using sourdough in a baked good recipe, a good proportion to remember is 1 cup of sourdough starter equals 1/4 c. flour and 1/2 c. liquid in the recipe. The cakes I've substituted in this way were amazingly moist, and in the case of chocolate cake, cleverly disguised.
Finally, The Bread MethodI have tried kneading sourdough bread by hand, and by machine. I have tried "folding" the dough at several points during it's first fermentation time to incorporate air. I have added commercial yeast along with starter in bread. Pretty much any source I've looked at, I've tried a little tweak here or there to see what would happen. I'm not sure I've had any bread that was downright inedible - sure some were more of a duty to eat, and some graciously became nothing more than breadcrumbs to make into something else, but by in large, sourdough bread baking is a frugal endeavor garnering little waste.
Since I do bake by weight, I've tried a number of recipes posted by weights, and I have never had as good luck as when I use the Lahey Bread Method. His proportion of 300 g. liquid to 400 g. flour seems to be perfect for what I consider to be the best bread I can produce. Since I bake it in a cast-iron pot, I don't have to fiddle with contraptions to get steam into my non-professional Hotpoint oven. Cast-iron is a marvel, and it produces bread with a crisp crust and perfect custardy interior. I may be limited to size and shape (round, or slightly oblong), but to me it's worth it. I purchased a
Lodge 5 quart Dutch oven 
when I started making Lahey breads, and I'm so glad I did. It's a reasonable price, and I only use it for bread.
Lahey's method calls for a mere 1/4 t. of yeast, for which I substitute 50 g. (about 1/4 c.) sourdough starter. If I make a bread using 100% white bread flour, it rises the best and fastest, but I've also had good luck using part high-protein wheat flour (also called white wheat, or hard winter wheat), and even using up leftover cooked oatmeal or other breakfast porridges. Lahey's method is also considered no-knead, but I knead it in the bowl for several minutes until it's slightly sticky and well formed into a ball. I think it helps that I always use the same earthenware bowl, since I can judge it's rising progress at a quick glance.