Hey brother...I used to be a 110 pounds at 5 ft 9.Now I am 160 pounds.Nothing great,but I have improved and I am growing fast( all natural and haven't doled out a single cent to Weider or Cell tech,not even creatine or protein powder).Dunno if I did it the 'right ' way but this is what I did:stick to power moves(squat,deadlifts and bench,dips,chin ups,rows,BNP's).Use the first one month to get the form right and then blast away with the heaviest weights u can handle to maximize ur beginners gains.NEVER workout more than 3 times a week.Eat like a pig and sleep like a tree.
I used the following split.
Mon:Back and bics
Tue:REST
Wed:Chest and tris
Thu:REST
Fri:Legs
Sat:REST
Sun:REST
Mon:Shoulders.
There are lotsa bros here who know their shit better than me.I have learnt a lot from em.So just browse through the posts and u'll get ur fundamentals in place.If u want ONLY abs,then I am not the right person,cus I NEVER work abs.Also having abs that show and developing abdominal muscles are 2 different things.U'r abs will NEVER show(even if u have trained em like hell) unless u cut up and loose fat.But do u want to cut up at 6 ft@150 just to show ur abs???. First get the larger muscles in place ,abs are secondary in my opinion, esp for pencilnecks like us.2 cents humble advice from a fellow pencil.