I’ve made self bows from both the oak boards found at hardware stores like Home Depot and from hickory staves. I suggest starting with an oak board a full 6′ long with grain (rings) that run the full length of the board. You may have to do some sorting, but it is worth the time.
As for the hickory, I suggest shagbark as the grain tends to twist less than the bitternut variety. Good luck and take your time.