SB, You need a bow square to get started. This item attaches to the string with an extension that sits on your rest. There is a scale on the side attached to the string with a "0" mark that referenced the point where the string is square to the arrow and string when on your rest. Attach the square and rest the extension on your rest where the arrow would cross the rest. Now check the scale and attach your nock so that the bottom of the nock is 1/8" above the "0" mark. This is a good starting point. When you have this done, check the Easton catalog on how to fine tune your setup. You may have to move the nock set slightly to fine tune your setup.