I WANNA GAIN WEIGHT?

HI, IM TRYIN TO GAIN WEIGHT..IM 5'3 & 100 LBS..I DONT REALLY HAVE ANY CURVES..I EAT ALL THA TIME AND IT SEEMS TO ONLY GO TO MY HAIR CUZ ITS REALLY REALLY LONG & WONT STOP GROWIN..ALL I REALLY WANT IS BIGGER LEGS & , IM GOOD EVERWHERE ELSE..ANYBODY HAVE ANY SUGGESTIONS OF WHAT I SHOULD EAT? TWINKIES & HO HO'S MABY?