Depends on what sort of equipment you have access to. If you have a gym with weights, that’s the best bet for building muscle. 

r/bodyweightfitness is a good resource if you have little or no equipment. 

I second the body weight one. Also there's r/ftmfitness

I just got my first testosterone shot yesterday after being on a hormone blocker for a few months. I wanna make the best of what I’m getting right now and was wondering what exercises or lifting things could help me build a more masculine frame. My main priority is the shoulders, mine are fairly dainty and it gives me away fairly quickly.

Just started T, exercise help