You can either buy an agenda from Titles, or during Welcome Week you can get one free from the Maroons (they give them away in a grab-bag). Same goes with an erasable calender.
I forget exactly what you get in the move-in package, but from what I recall it's your keys, your magnetic building card, your phone information, the residence handbook and a few other things. You will pick it up from the appropriate service desk (either North or West Quad) depending on what residence you're living in.
You are supposed to have your student card by that time, yes. If you haven't recieved it make sure you have some other kind of photo ID.