Your instructor should give you an idea of what is going to happen but here's a few more tips:
1) Show up rested and sober
2) Show up on time
3) Relax and have fun - you will remember these dives for the rest of your life.
Although you are diving in the big cold water, these dives will not be a hard as the pool dives. You should only be asked to do the basic skills (gear assembly, mask clearing, boyancy control, weight system removal and installation, regulator removal and recovery, air share and a few others). No ditch and don, no extended no-mask swims, none of that stuff. It will be deeper and presumably colder than the pool, but water is water. You've been trained in every skill you wil need to peform - just do them the same way you did them in the pool.
With luck, you will get all the skills out of the way in the first one or two dives. Then, the remainder of your dives will be real scuba dives where you will get to see some sights and have fun.
Your instructor should give you a list of dive gear to bring so I'm not going to belabor that.
Assuming you are diving in a wet suit, bring a couple of big towels and some warm clothes to change in to. As mentioned in the posts above above, a cheap tarp (6 foot by 6 foot or so) will help give you a relativley clean & dry spot to orgainize your gear. If you have one, a big storage bin (think Rubbermaid) makes a handy way to organize and tranport your dive gear.
Bring a cooler with a bunch of bottled water or gatorade and some light snacks or sandwiches. You are going to get thirsty and hungry. Minimize your caffeine intake - the more you pee the colder you get.
Bring a camera so you can have your buddy take a picture of you in all your dive gear - your mom will love it!
BTW - if your mask did not leak in the pool with the moustach then it should not leak on the checkout dives. Shave if you want, but I dive with a beard and moustache all the time. If the mask leaks a little, just clear it. Unless you have a real Santa Claus beard the hood will work fine.
Once again - relax and enjoy. Let us know how it goes.