Ok, so according to your personal goals of starting at 18, which I still can't figure out even after reading your explanations, you have a 3+ yrs.
Start by learning all you can with the the search engine, books, and magazines. A lot of this information will seem conflicting and confusing at first but you'll soon learn what works and doesn't work for you.
While learning through reading, for the next 3 yrs. get into a gym and start asking the more experienced trainers about their programs. Ask them to show you how to squat, bench, deadlift, and row properly. I promise you will not grow nor will you learn what works for you unless you get into a gym and start lifting weights.
Good luck!
DM