1. What is the best programs for gaining muscle mass? except Iron born, I'm already doing it.
2. My right lat is much bigger then left,what exercises should I do to balance them? My only equipment
is a set of dumbelles 15kg and 7.5.kg,.
Three answers
1. Let the weaker muscles determine the intensity of your workout
2. Unilateral (One lat, One leg, or One arm) exercises
3. Finally, be patient it does take a little time to undo the imbalance
Gaining muscle mass a.k.a 'Bulking up' or sarcoplasmic hypertrophy, is a matter of the right nutrition combined with the right number of reps, sets and weights. Here , here and here are some easy pointers how to get there. Here too.
Get enough protein, but not too much.
Good luck and all the best.