I really like the PDQ LPN book, if you're an RN they have a PDQ RN version. I also keep my drug book there as well, luckily the unit that I work on also has an online database with just about everything you can imagine on it.
I would recommend reading up on the procedures for inserting/removing foley catheters (indications, contraindications, etc.), inserting IV's and signs of IV patency versus infiltration, administering blood, central line dressing changes, discontinuing central lines, accessing Port-a-caths, physical assessments, administering SQ/IM injections, etc.
If you REALLY want to get a head start go ahead and start looking at some of the drugs that are commonly given on a med/surg floor, also look up nursing considerations when administering said drugs:
IV: Zofran, Dilaudid, Ativan, Morphine, Phenergan, Reglan, Nubain, Toradol, Protonix, Vasotec, Lasix, Zosyn, Vancomycin, Ciprofloxacin, Unasyn, Maxipme, Avelox, Rocephin, Flagyl, TPN, PPN,
IM: Geodon, Vitamin B-12, Influenza vaccine, Pneumonia vaccine.
SQ: Lovenox, Arixtra, Regular Insulin, Lantus, Novolog 70/30,
PO: Lopressor, Digoxin, Lortab, Percocet, MS contin, Roxicodone, Oxycontin, Klonopin, Valium, Xanax, Trazadone, Lipitor, Coreg, Lisinopril, Lasix, Aldactone, Cardizem.
I'm sure there's many more that I'm just not thinking of. Bottom line though, there's only so much you prepare yourself for, your real learning will take place when you hit the floor, this is an exciting time for you so don't sweat the small stuff just focus on learning as much as possible from your preceptor.
Oh and fasten your seat belt, Med/surg can be a crazy bumpy ride, be prepared to see EVERYTHING under the sun!