Welcome to the site, and you've been given some good advice, this site is the best resources out there for info about everything primitive archery related. I would also recommend the Traditional Bowyer's Bible vol. 1 as it covers all the basics, from cutting and seasoning wood to tillering, and handling different types of wood (osage vs. whitewoods, etc.) Vol. 2 has a good chapter on building board bows. The best thing to do is read up a little, ask some questions, and start making shavings.