Here is where I got my sourdough bread info to start with:
I did not use yeast for my starter, I just let it sit on my counter and gather the natural yeast in the air. I have had it going for a few months now and it still works wonderfully. I use honey rather than sugar in my recipe and look at how great it turns out!
I have made three loaves of the pesto bread so far and my family can't get enough of it.