Ive been accepted and will attend what do i need to do before the first day?

Can I pick dorms?
Can I or should i do anything to prep?

Congratulations on being accepted! My daughter is just wrapping up her junior year at Bates (it’s finals week).
There really isn’t much to do. Just wait for things to happen - you have plenty of time.
Bates will contact you about housing; they send out a pretty detailed questionnaire, and housing is assigned based on that. The dorms are generally excellent, and there are going to be two spanking new dorms for this fall…so, no worries. You will be assigned a dorm and a roommate.
The Aesop trips haven’t been posted yet, but you’ll get a very good idea on what they involve by looking at those from past years. I believe Aesop is now compulsory. I would’ve highly recommended it anyway. You get to choose the type and level of difficulty. The course catalog and requirements are online, so you could take a look at what you’d like to register for.
Other than that, not much to prep for. Make sure you take plenty of winter gear (jackets, hats, gloves, etc - and a good pair of winter boots). Oh, and decide on laptops - Mac vs. Windows - both work just fine, so it’s personal preference.
Good luck!