Thanks for all the feedback guys!
I do know I'm going to need to lift a LOT of weights. Any good workout regimens for beginners that work all parts of the body with emphasis on muscle building (versus weight loss)?
Also, for clarity the surgical/physical condition, I was born without an esophagus, so one was 'built' for me out of part of my stomach, resulting in a very small stomach. I don't know all the details, but apparently it works akin "having your stomach stapled'' (according to my parents when they explained it to me as a kid). I don't know how exactly it affects my ability to gain weigh other than by not being able to each much food at one time, though I'm sure there was something else to it. To be honest I don't recall exactly.