Picking up what Vermonster started, to figure the arrow spine we'll need to know your draw length to figure your actual draw weight and arrow length. I'm going to assume your Hummingbird is cut to center, but if it's cut past center we'll need that, too. Arrow weight can run from 9 to 12 grains per pound, with most of us leaning toward the heavy side, so around 500 to 600 gr total would be good. I prefer broadheads on the heavy side, 160+, as they shoot best for me. I like wood shafted arrows, some here shoot alum and there are lots shooting carbon so you will find plenty of help with whatever you want to shoot.