Hey Lewis.
You can start out by making your first bow out of a board from home depo. Red oak should work, just make it long over 60 inches. Also try a piece with straight grain. I myself started making bows when I was around 13-14, I made my first bow out of a board from home depo. If you want to try a stave bow you can look for ash which is very common in cities, live oaks, oaks, mulberry. If I get more red mulberry staves Ill give you one, just pay the shipping, and the only condition is to post as you make it : ) anyway try the board and ask questions and dont worry if you break a few.