You say you just got the plane out and got some radio gear? You don't have the instructions, so how did you set up the control throws? They are pretty critical that you have enough but not too much, 1/8" change in thro on any surface makes a noticable change in how it handles. Just trying to make sure you got all the bases covered. As for the CG, usually around 25% of the wings chord, or at (or slightly in front of) the thickest part of the airfoil.
Save me the "you need to get lessons"
Ok, but will you at least come back here and post your experiances, be them good or bad?