Hi, I think that the advice you've been given above, is good as far as it goes. You can learn more on my website www.rcaeronauts.com , sinceit goesinto the location of CG in more detail.

As a beginner, you probably fly a high-wing trainer and the usual CG position is at the 25% of MAC(Mean Aerodynamic Chord) position. I would even go down to 22 or 23% of MAC to start out.Just be sure that you measure the 25% correctly. If you have a rectangular wing on the plane, it's just one-quarter of the wing chord, back from the leading edge of the wing. If your wing is not rectangular, refer tomy website for some ideas.

This is a great hobby and the best way to enjoy it is to learn correct techniques from the outset, both on and off the field.
Best of luck and happy landings.