Hey Prateek,
Try searching and reading here on forum. A lot has been already posted over it. Balancing is not an easy part. Theoretically, you CG should lie 1/3 from the LE of wing. or you can say 30% of chord. So, from there you can calculate. And the best method to check is try balancing the plane on tip of your finger. Place finger tip on both halves of wing at 1/3 of chord. You'll come to know whether it is balanced or not.
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