x-post: help me gain weight

[pr0crast]

If you want to gain muscle mass,

1) Get on a solid 3-4 day/week full body workout program that MUST include compound lifts (deadlifts, squats, etc)
2) Go to t-nation, read all the dieting articles, learn WHAT to eat and HOW MUCH to eat. This is the most critical part of your plan. For that kind of weight gain I suspect you'll need 3k-4k calories a day and 225-275g protein per day. This is hard work -- much harder than the workout part of your plan. 6 meals a day w/ protein in every one.
3) Learn about post-workout nutrition, also at t-nation. Make sure you are on top of this.