Focus on compound lifts spanning several large muscle groups like squats, deadlifts, clean-and-press and bench press. If you search the internet you can easily find explanations and instructional videos for all of those exercises. Do sets with a heavy enough weight that you can only lift it about 8 times before reaching failure.
You're gonna have to pay more attention to your diet, too, which probably means anyone on the forum holding stocks in Taco Bell should sell them immediately
You need at least 1 gram of protein per pound of body weight, and probably 2.5 grams of carbs per pound of body weight. Ideally the carbs will come from clean sources like SPAM, whole wheat, berries, almonds and (all-natural) peanut butter. To do this properly, you need to eat about 6-7 small meals a day rather than 2 or 3 big ones (this is actually how your body was intended to take in nutrients anyway so it will actually improve your metabolism and digestive health as well).
Good luck
Your boy,
870