I'm not trying to be mean or insulting, but have you flown R/C for long?
If you have not, this is not the plane to learn on. It is fast and very responsive, and will not give you much time to think about what you are going to do next.
To set the C/G. Measure the wing chord at the root (center) and the tip. Add these measurements together and divide by 2. Multiply the sum by .22. This is the distance back from the leading edge of the wing to balance the airplane. After a few flights, if you want a more responsive plane, you can move the C/G back a little.