RE: beginner seeking advice on arrows
They way I like to do things is cut my arrows to 29" bop because I draw 28". I try to calculate the spine of the arrow to be correct at this length. Sometimes I get it, sometimes I don't and have to play around with point weight and such. There's probably a better way to do it, this is just how I've done it. You know your arrows are too short when you come to full draw and your arrow point isn't in front of the bow. The way Stealthycat described is probably the best way to do it because you can get the most out of the shaft before concluding whether or not the arrow will shoot well out of your bow.
Brandan