Do the basics:
triceps: push ups , bench press, dips
Biceps: pull ups
Shoulder: shoulder press, side
Any special diet??
Lol this a hard question.
On the beginnings u should look that u do sports consequently.like 2-3 at least times a week. For a longer period.....
Try to reduce sweets and much carb and focuse on portein meals (chicken, tuna/ fish, milkmproducts..) .
If u take some protein shakes or amino (not really neccesary) ,try to do it immediately after workout. This is based on the fact that tge creatine-kinase an enzym ist activadet a short periid after training....blablabla
Stay focused,while u train and plan it
Enyoing the workouts helps me