Koan is right ,hard wood to learn on, Long and wide is a good idea,That is the wood I started with and it almost made be quit, and I still blame my shot draw problem on it. Don't get me wrong I have seen some great bows made from it,light and fast but they will explode and I
mean EXPOLDE.
Depending on your draw ,say 26 inch draw I would go at least 66/68 Nock to nock and 1 1/2 to 1 5/8 at the fads and tapper to the tips.
Pappy