Don, if you're just starting out in this great hobby, I think you should start out with a flat blade. They are the easiest to use, and you can cut a straight line with them. The stock thickness of the stock, will dictate what size of blade you should use. I would suggest that you do lots of practice cuts, and learn how to turn the wood so that you get nice crisp corners and points. Only after getting used to flat blades and how they cut, you should then try the spiral blades. As to what brand you should use, that's a decision for you to make. I prefer Flying Dutchman brand, but, Olson brand blades are ranked right up there also.
Len