When it comes to working out for strength or size there is 3 main components to a good plan: Nutrition, Recovery and Exercises
Nutrition: As everyone knows your body uses protein to repair muscles, so be sure to get enough (1.5+ grams per pound of body weight). Carbs are also very important as they give you the energy to workout in the form of glycogen.
Recovery: Your body gains strength and size while you are recovering, not working out. most people don’t put much effort into their recovery, which is a huge mistake. Getting an optimal amount of sleep is very important. Make sure to have good supplementation for recovering, that includes keeping your body hydrated. Another good way to help with recovery is foam rolling or massages.
Exercises: When you are trying to gain strength as well as size it is important to use as many muscles as possible, in the form of compound exercises. Be as explosive as possible, fast on the positive portion of the exercise. Properly warm up for every exercise, to prevent joint and muscle injury.