1) You. I will give some guidelines as to their behavior in this world (none of them will say their own name), but you guys will have free range in their personalities and behaviors. I haven't quite thought of how everything will work regarding battles, but when I post an ooc I will work all that out. 

2) You could definitely start making a CS. It will mostly just be the standard stuff. The only thing I'll say is you should make one for you, and one for your pokemon. All pokemon will have to be in their unevolved forms. Obviously no legendaries or anything like that, but you have free reign on anything else. I will post the ooc soon (today/tomorrow) where you can submit it. 

3) Yes. I'm not gonna be too strict on the major. If there is any conceivable reason you would be taking an upper level bio course you should be good. To keep the possibilities open, we'll say everybody is a senior undergrad, and are invited on an internship by Birch for the summer after graduation. So that would mean you are a pre-vet student.

Also, I guess it goes without saying the first option is where we're going to go with this one.