Hi, I'm not sure of the wood choices as I generally make self bows.
A couple of points...
If this is your first bow, I'd suggest going for a manageable draw weight to start with and maybe a solid Hickory bow, just to get a fist bow done without over complicating it. You can also go for 28" draw to start with and then see how far you can go.
To try and dive in and make a warbow first time would be a big test of skill, patience and nerve
Keep the bow wider at the tips until you have got it bending back to brace height and braced, this is because a very narrow design like an English longbow or Warbow can be prone to bend sideways in the early stages and the width gives you room to move the tip across one way or the other. 1/8"-1/4" movement of the stringline at the tip is enough to stop the sideways bend and as you remove wood from the sides of the tip, it will slowly become narrowed anyway.
If you haven't seen my blog (Bowyers Diary) there are plenty of ELB and Warbow builds on there to follow.
Del