For you folks just coming into the program, M. Ramirez Talusan has a short list of advice over at the MFA Blog.
Some of them may be a bit obvious (like #7), but I think it's a good start towards getting in that mindset (and may be valuable to anyone, not just incoming writers, just now getting back into the semester). Maybe?
As for her #4, I couldn't agree more. That's one thing I wish I'd done earlier in the program. Make an effort to get to office hours; if you're working off campus, say 9-5, you may have to sacrifice a bit and come in early one day so you can leave early another day in order to make it to the university for some one on one time with a professor.