I would like to start bodybuilding but not sure how to go about it. i am 23 and not really to sure about it.?

i waight about 10stone and can not put weight on as got fast matabilism. i would like to put weight on and lots of muscle. i would like some help with dietary ie what to eat , when to eat. i have been recommended to taking pro m to put weight on but dont know how to put it into a dietary of protain and carbs. if some one could please help me with it i would be very greatfull. is their any supplements that you would recommend as well, or good internet site that will help me.