I read the trilogy about 10 years ago, and my memory is a little sketchy but here are the things that I remember:
A group of teenagers got sucked through a portal into a magical world where they, over time, come to be the inheritors of each of the branches of magic with the people that they meet (there was a dwarf and an elf).
I remember that the girl became the necromancer (not evil, it's all a part of nature) and one of the guys sort of went off on his own thing for quite a while.
I recall that book two was titled something along the lines of "The Road to ___"
I know that it is not much to go on but can anyone help me out here?