I would say your best bet is to train about 3 or 4 times/week, as tolerated (if no progress is made with four, cut back to three). Really concentrate on compound exercises like squats, deadlifts, chin-ups, bench presses, etc.). Do NOT work out for more than 40 minutes at a time. In addition, concentrate more on "thickening" type exercises (close-grip chins) than "widening" type exercises (db laterals). More important than your training strategy is diet--you really will have to overeat a bit to get big with a frame like that. Creatine is a useful supplement, but in your case a meal replacement might be better because it will help you get those extra calories and protein. If you get fat, that's fixable, but try to fill out that frame with lots of quality eating (no cheetos). Good luck.
Re: Re: Getting Big For My Frame