How would I make it so that if you entered one region, one set of script began, and if you entered another region, another script or mission would begin. So lets say there are 2 doors, and you choose which, and if you enter one, you have to follow one mission, and if you enter the other, you do a different one. Is this possible, and if so, how? gtpwn

It's the exact same as doing it for one region, you just do it twice.

Would it have to have any script changes? And what order would it be in? Would you set them both as objectives #1?

Search through the shipped campaign scripts for OnEnterRegion. They should give you a good idea of what you need.