The white sneakers/white socks/whiteshirt thing is a MUST when you're in the clinic, which is only once a week during 1st semester. Some instructors on the clinic floor are very very picky about the dress code and will even send you out if you're not following it. During lecture though, none of the teachers really care. You'll probably be able to get away with your current shoes in lecture and preclinic as long as their not super bright and are at least mostly white. As for the thinkpad, they give it to you the first day of orientation along with your scrubs. It's a part of tuition and you're required to get it through the school. It's a thinkpad t61 series which isn't too bad. You won't be able to get out of getting it either (trust me I tried). It comes preloaded with lots of stuff that they require you to have.
P.S., All you guys are lucky to have the color scrubs you're getting. My class is stuck with the lovely "Seaspray" green. When we all move as a group, we look like a giant snot rag coming to swallow your soul.