I’m sure Sasquatch told you how to seal and season the splits. Pretty much all Osage is good bow material, so you may be starting on the “most difficult” piece, not the easy stuff. Your skills and attention to detail with the knapping crafts will carry-over to the primitive bowyer craft. Anyway, you’ll get lots of advice and comments on the BOW section of the forum – post a few pictures of your splits (backs, sides, and end grain), and begin another adventure!
H