Hi Barbourdurham, the following is a handy link in this thread's context. I know Del and he makes a good bow, so his video series may help you:
http://bowyersdiary.blogspot.co.uk/2015/12/yew-elb-build-videos-and-starting.html
Cheers, Bob
Dell will take a nasty bit of yew that most would burn and makes a bow from it. He will saw, plug, splice and make a shooter.