Hi fredie
I agree with everyone here that you better try an easier design first.
BUT since I know I started with what I really wanted to make and otherwise I would not have started at all:
For a paddle, try around 60 inches or a little under that, just a bit more than twice your draw.
Understand how width and thickness and tiller work on a pyramid bow. You need not build one but understand it.
Look at your paddle. Obviously it's much too narrow in the inner limbs and too wide in the outer. Therefore have it bend mostly in the outer limbs and just a little in the inner limbs and the handle. Those outer limbs end up real thin. Don't bend it hard until they are thinned enough or you mess up the inner limbs. Flip the tips and keep them stiff because of the string angle.
I make mostly paddles, I love paddles. Here's one where you can see how the tiller ends up:
http://www.primitivearcher.com/smf/index.php?topic=37523.0For a first build, there are a couple of obstacles and adventures. Good luck!