Do not let learning slow you down. There is more than one way to build a great site. You are going to make mistakes, it happens. Build your way through them. A year from now, you will wish you did more work. I still have days were even I do not get what I think should of been accomplished in a day done, but I am always doing something.
If you are getting bogged down with info, just stick to the basics mentioned in the Niche Store Guide. Start there and build and backlink a while. In this business results are most of the time not instantaneous. Just keep building. Just keep building. Doing Something Is Better Than Doing Nothing!!!