Any time! I'm learning all of this myself, from som Trad forums, nags, youtube, and a social media buddy...

how do you determine what wood to use?
well, straight grained woods, with no runoff for a "board bow" 3/4 x 2" board will do, 66-72" length tip to tip. Otherwise, getting a stave (split length of log) and caving it in is another method.
I ran down to Barnes and Noble and bought "Traditional Bowyer's Bible Volume One"...lots of great starter info, but mainly stave bow oriented. I will be getting volume 2 VERY soon.
If you watch any YouTube, check out BoarriorBows. Mike is an awesome resource! He has quite a few build alongs, including board and stave based. He even does a Osage Snake Bow! Its all about the grain!! Check him out, you'll see what I mean! There is another feller on there called twisted stave, and he's pretty good too!
Sites to check out: TradRag.com, StickandString.com...great guys and info...