If you want to fill out and generally get bigger, while staying lean, I highly advise heavy squats. Programing wise I also highly recommend Starting Strength. Nutrition, you want lean protein, veggies, fats, some fruit. Lots of it.
The nutrition will be the vast majority of it. Eat a lot, cleaner the better. Lift heavy **** and it will increase your appetite. If you don't currently work out you'll see fast gains pretty much whatever you do so don't over think things.
I have also heard good things about this program:
http://www.amazon.com/Scrawny-Brawny-Co ... 1594860882This was my result from crossfit and eating clean last July:
Dash wrote:
Me as of today July 24th:
Weigh 173, waist 34" chest 42", bicep 15". So I'm looking to go up 10-15 pounds from here while maintaining about the same level of leanness. I'm sure I'll gain some fat but that's ok. I can trim that off later.
Since then I wanted to gain strength and muscle. I'm currently at 185-190 but need to get rid of some fat since my diet was pretty crappy relative to what i was doing. I blame the cold weather =p
Anyway from doing the strength program and eating a lot my shoulders, chest and back are much wider, gained size in general and definitely added muscle / got stronger. This is me a couple of months ago, hard to tell but you can kinda see my back looks broader which is what I was going for pretty much:
Hope that helps.