Hmmm yeah..say you have a few basic skills aviaable to you.
Then level up according to <img src="/ubbthreads/images/graemlins/div.gif" alt="" />.
E.g you have say skills for swords,daggers,bows,fireballs and say traders tongue. You level up in these skills only.
To obtain other skills you could say read books...which can be found anywhere.It may be fun like treasure hunt.
Explore a house..you might be able to find a mages building where you can further find books which allow you to invest say freeze,elemental hail or something.
Or after completing a quest your reward might be to unlock another skill(s).
