A) You should probably purchase your laptop before school starts, as you will have lecture beginning the first day. There is an option to increase your financial aid if you cannot cover purchasing the laptop with the financial aid you've been given, but you have to buy the laptop before you request it (as they require a receipt for the increase to process). With the biochemistry pre-session, you could probably get away with not having one (i.e. if you're waiting for a promo or some laptop that comes out after school begins), but for the most part, a laptop is pretty much your lifeline. You will also be required to get clearance from Dental Computer Services (you drop it off for a day or two while they do checks on it to make sure you're eligible to be on the school network), so the sooner the better, since the traffic for that builds up as the time goes on.
B) Do NOT buy all of the textbooks, no, no! You will hardly have enough time to go through the seas of PowerPoints as it is. I haven't had one class without PowerPoint, and unlike the medical school, they do not print them off for you and supply you with organized binders for each class (where does our tuition go... you'll be asking yourself this again when you are sitting on the rock hard wooden chairs of Mortensen Hall for endless hours of anatomy/physio, unless they decide your tuition dollars are worth putting you in the brand-new Centennial Complex with swiveling chairs and personal ethernet ports/power outlets where the first-year medical students are... no, I'm not bitter
) so if you want them in paper form, you will be responsible for printing them out yourself. I bought a few textbooks (some professors require you to buy it and show proof of purchase, or it negatively impacts your grade), but for the most part, I've found board review books to be the most helpful if I need supplements outside of the PowerPoints.
Physio - BRS Physiology (by Costanzo) is good (it's not magical though... everyone said it was magical, but it's not really). She also has a textbook that I got from a friend in med school, which is basically a glorified version of the BRS. Also good, but no time to read.
Biochem - Lippincott's Biochemistry is a pretty good supplement to the High Yield Biochemistry review book (the guy who wrote High Yield Biochem is at LLU, but doesn't teach our biochem... I think you'll have a few lectures from him in physio), which was what they required us to buy for our pre-session... because High Yield is kind of a bare minimum. I'm not sure how similar your pre-session will be since ours was the guinea pig trial run, so I've heard they've already made changes (i.e. yours is 4 weeks when ours was only 3, etc). Biochem in general is just awful (in my experience), though, so I was happier for the shorter since my retention for boards would probably not change regardless. That and knowing that the relevance of this class to my day-to-day career experience will be nonexistent... so, whatever gets me through the torture faster is (unfortunately) what I'm interested in for biochem...
Anatomy - As for anatomy... BRS Anatomy is pretty subpar, lots of mistakes... Road Map USMLE Anatomy is probably better, but I didn't use it a whole lot-- a friend in med school lent it to me. For the most part, PowerPoint will be enough. A lot of my classmates and I liked Netter's, but some people like Thieme... I ended up getting Netter's on my computer, which was infinitely more helpful because I didn't have to lug the big atlas around. The vice chair of anatomy at Loma Linda co-authoured a photographic atlas that I bought in undergrad when I took gross from one of the other co-authours, and it is helpful to see the dissections in "real life" rather than in watercolour, but not essential in my opinion... nothing will replace actually going into lab and putting in the time there. Netter's should be enough to guide you. Do NOT buy the Netter's flashcards. They will seem very tempting, especially when you see the other students who have been duped by this lure, because "I can use them wherever I go!" Yeah, that lasted about two weeks for me before the PowerPoint whirlpool swallowed me whole. You simply will not have time.
As for neuro (which is part of anatomy, you'll take it spring quarter), the notes are not that great... but I also don't have enough time to read the review books I've gotten from friends. I have "Neuroanatomy Made Easy and Understandable" and High Yield Neuro, which have been ok but again, probably haven't read enough of them to give it a legitimate review.
Micro - Now that micro is part of D1, I'll let you know that Clinical Microbiology Made Ridiculously Simple is helpful (also one that people deem magical), but I find that it's not quite enough, so I supplement it with High Yield Micro (which is not as bare bones as the High Yield Biochem). People like the Ridiculously Simple book because it has a lot of helpful mnemonics and easy-to-read language. The textbook that they currently require for this course is horrible, but everyone was required to get it. Just make sure you supplement it with stuff you can understand.
Dental classes - Some of my classmates have bought the textbooks that are associated with our dental classes (operative dentistry, periodontics, etc), claiming that they will put them in their "future libraries"... but that to me translates to a waste of space and money. These textbooks are not cheap. The only textbook that I think is worth buying is the one for operative (Fundamentals of Operative Dentistry), but definitely not the perio textbook. I guess I haven't taken enough dental classes to know what else is worthless/worthwhile, but I will definitely be doing my research before putting down the Benjamins just to beautify my library.
Hope that helps. I know that looks like a lot, but it's just a lot of words.
Don't stress-- enjoy your time before it starts. Feel free to ask more questions if you need.