The Buckmaster was (is) made by Bear so has most of the same parts as Bear bows. If I remember right the draw length can be adjusted by changing a module on the bottom cam.The modules change the draw length in even inch increments. Also the string attaches to a sliding pin on the cam for finer adjustments. A module usually costs about $10-$12. Add labor.

If you have a decent shop person he should know how to measure for draw length. For starters the best way is to measure your "wingspan" and divide that by 2.5. This isn't necessarily what you'll end up shooting, but it'll be very close to what you should shoot. And the bow is always adjustable.

Setting draw weight is no big deal. Turn each limb bolt equal turns till you have the bow set where you can draw it while sitting flat on the floor with your legs out in front of you. This is a good way to do it so you don't end up with too much weight.