Welcome to the world of lament bows lots of variables & guess work ,draw length, bow length, width, front view, and taper rate ,riser length,reflex etc , with a 1/8 bamboo back , 3/8" core , .005 taper rate, HH front view taper should get you in the ball park for a 12" riser, 1 3/8" wide 68"@28 approx 50 ish lb better to be slightly heavy & work down via side tiller ! But really only one way to find out for your self !
You should have a good idea after the first keep notes !