The main thing that sourdough takes is time, rather than effort or ingredients.
There are also several cookbooks I've found really helpful, chief among them Tartine Bread, Flour Salt Water Yeast, and The Sullivan Street Bakery Cookbook. The main thing that sourdough takes is time, rather than effort or ingredients. As long as you have some patience, you can coax bread out of your starter. Don't be discouraged, and don't be intimidated — sourdough is for everyone, not just professional bakers.