A-Best: I'm going to go with 148 and not 48 ibs cuz u b dead boy. This depends on ur body type or u small, medum or large big bones.
look on the web and and answer the questions it will tell u ur right weight.
Then to increase.. is protein
so eat
many meals a day up it the bigger u get
protein powder is good if u dont eat much get vitamin b1 and watever u need to make ur metablism faster so u can eat more.... trust me they work ...