Easiest way is to get a dropchecker (DC) with a kh 4.0 solution and have a beetlecounter and a good needlevalve for fine addjustment.

Turn on the CO2 and at midday watch the DC Then adjust the bubbles if you got too much or not and observe the DC the next day ect. Adjusting too much dont help since the DC dont respond so fast, and its also good to only read the DC each day at about the same time.