Gaining Muscle for skinny 17 year old?

It be awsome if somone could recommend a good home workout plan. ive got a door jam pull up bar ive been using but i dont know much about muscle groups and how to stimulate them. The areas id like to work out the most is abs, pectorals, and all the arm muscles, other muscle groups cant hurt but they are not top priority. Id like the workout to be simple as possible and id like to avoid lifting wieghts but if i absolutley cant gain wieght without them then ill give it a go. Im not looking to body build just look good at the beach thanks!