I'm going to disagree with the advice to set the CG "slightly nose down" for initial flights. When you mark your CG location per the instructions, if the plane is sitting nose down you know it's forward of that spot but you don't know how much. So a much better route to go is pick that spot and set it level. If you feel the need to go a bit farther forward then pick a spot farther forward and again, set it to be level there. Every trainer ever built will fly nicely at 25% of the MAC, easy enough to calculate with one of the many online CG calculators. Of course, with the rectangular wings of most trainers, you can just measure back 1/4 of the chord and put it there. You could go to 24% if you want it to be more stable in the wind, and 26-27% if you want it to land more smoothly and do aerobatics better.