I havent posted anything lately, but I am ALWAYS lurking.....

Anyways, I have a few questions if you guys (and gals) would be so kind to answer. Basically, here's the deal:
Right now, I am a communications engineer (which is just a glorified title for a remote helpdesk position for a few govt contracts). $$$ and benefits are good, but that is it. we support software and the connectivity of it and THATS IT. Sooooo.....I have been studying and looking constantly for new jobs but SC is no economic boom especially for IT.
well, to get to the point as i have already rambled way too much here, I got offered a IT Specialist position which, judging by what they have told me will probably move into network admin. I am not totally sure of my job duties yet. its a healthcare facility and a small (but growing) company and there are only the net admin and one other person and then me.
I had to take a small pay cut b/c i couldnt get them to take me at my current rate. they said they picked me out of many, many people (they all say they i am sure) but said i must prove i am worth what i make now (i work for very large company now). I hope its worth it to finally get to this level. this is the type of work i have been looking for but have been shunned away b/c of lack of experience. these guys say i have great skills they can build on. i dunno
well, again my whole reason for this ENTIRE RANT (again i apologize for its length) is that I had asked the other tech what they thought I should "brush up" on reading thru during my 2 weeks before I start and he said Active Directory and Group Policy.
my questions to you guys (FINALLY RIGHT

) is do you guys have anything else I should probably "brush up" on as well? obviously I have never done server admin only client side stuff or router/switch config, etc. and I just want to be impressive when I go in there.
I know they will teach me "their way" of doing things, but if i have the foundation of say GPMC or an enable router statement then when he says, we do this, I will already know 50% of it. at least that;s my weird way of thinking. I will already be REALLY nervous so I dont wanna mess this up
thanks for any and all insights you all can provide and again, so for the REALLY REALLY LONG post so early in the morning