I never tried choc milk as post work out drink, I guess people suggest it cause it has a lot of sugar in it (to restore glucose in the muscle), but it doesn't have much protein. That would be my only concern. Whey protein is great b/c is broken down quickly and absorbs fast.
I mix my whey with 8oz of water, so I just have it as a snack (cuz that's only like 110 cals) not enough cals for a replacement meal. I'm sure if you used skim milk, added fruit, or peanut butter it could be a meal.
Yes you can put the creatine in with whey. I have heard some people say to not mix creatine with milk or drinks with fat in them, but to be honest I don't know a ton about creatine. I have friends who mix it with juice. I just know the recovery time is the 1hr after you work out and it's best to have some quick absorbing carbs to restore the glucose in the muscle.
I was making my own recovery with a 1:2 ratio of prot to carbs:
*1/2 scoope of whey (10g protein)
*3 tsp of dextrose (16g of carbs/glucose)
*8oz of water
*5g of creatine (skipped the loading phase)
*5g of BCAA.
If you are going to take creatine be sure to drink a ton of water!
But I think you are on the right track...multi vitamin and whey protein are the keys! If you need supplements I'm a big fan of
www.bodybuilding.com They seem to have pretty good prices and you can go into the forum to read about advice, reviews, etc.
I am doing doubles, Monday will be my 2nd phase. I would say have your log ready for your work outs (record weights and reps) and write down what you eat. I think that is huge. Plus keeping a daily journal here has been great for me. Other than that...as Tony says..Just bring it!
GOOD LUCK!