Before you remove your old string, locate a repeatable reference point. Measure kisser height(if applicsble) and peep height. Write the measurements down and keep in safe spot. Remove old string/cables. Install new string/cables. Place bow in tuning fixture or bow vise. Use levels to get everything precise.
My bow is a Bowtech Invasion with the OD Binary cam with tuneable yokes. Basically a std 2 cam system. Starting point for nock will be dead level. Hybrid and single cam models i normally start between 1/16 and 1/8" nock high. For this application we want arrow dead level and center of arrow lined up with center of rest mounting hole