Film wrote How do I gain more muscle weight?
I'm trying to get bigger, I weigh like 115 and I really want to get bigger like on my arms, I don't have abs but my chest is like popping out now but I just want to know how to gain more muscle weight. Can someone tell me a few tips? I'm 5'7, 115 and I'm 15 years old.

Push ups and benching since your small start with like 15s or 10s each side and work your way up with with about 5 sets of 8-10 and maybe 6x25 push-ups