(keep in mind that this being a "real world" and you are just a regular man or woman so running into the first dungeon and getting yourself killed probably wouldn't be on top of your to do list)
I would pick :
illusion - invisibility and chameleon are priceless , charm spell would make me popular with the ladies, and so on ...
conjuration - why fight when you can cower in the corner cloaked and let the Dedra do your fighting for you
alchemy , maybe as a job
anyways , lets hear it...
EDIT
( and lets assume you get teleported in a town , not in the middle of a monster infested forest, and you are naked ...err, maybe not naked , but no guns and cell phones either)