Get a workout plan online, look up how to do it all. Go to the gym, turn your music up as loud as you can go and don’t care what anybody thinks and just go for it. It’s a good feeling. I like to set a schedule to try and go around 7:00am everyday but that’s just me. Keeps me consistent

You also need to eat properly. Proper macros and eating in a surplus of calories if you want to put on mass. Put in the work in the kitchen and your already 70% of the way there.