What's better Weight Gainers or Creatine?

Im really skinny guy who's 18 and 6ft and im skinny and i just want to bulk up on my arms..i don't go to the gym so looking to start that asap but Should i use weight gainers or creatine? ...which would be best use for me?..i just want to have big arms and a good body not looking into have abs or anything just as yet....I was thinking maybe if i ake creatine and go gym would be better?