Basic foundational compound exercises
Squats, deadlifts, Bench, overhead press, pullups (or lat Pulldown), rows (many varieties but seated Cable rows is good)
Workouts i pulled from aworkoutroutine.com where the author gives straightforward info on why these are ideal for beginners. These exercises are the foundation of any more advanced isolation program as well.
Eat a lot of protein, eat healthy, drink a lot of water and rest between heavy workouts. You could do a creatine supplement. I can gain quick with creatine though some is water weight.