Dberg hit it right on. Get backups running, if for no other reason than having that safety net...
I was in your shoes 3 months ago, but at least the backups were working when I got there. Now look at me... (still working on it). Don't worry about the users. As long as they can do the jobs they were hired to, they can wait until you've got a better picture of what you've got.
First thing I would recommend is getting an inventory of the network and status. For the price (free), try Spiceworks (
and let it run it's scans if you are able to. It gives a pretty good impromptu assessment. It's free for the basics and I've found that it at least lets you see what's out there and the status.
Software licensing is another issue. My company had all the software in the server closet. Dig and find what you can. Then talk to accounting and see who the bills were paid to for IT services. That will give you a starting point as to who got what from where (or at least where the money was going). After that, just start making calls to those companies.
Documentation... a real sore spot for me. I can write documentation, but why should I when I don't have to. If you've got Domain Admin rights, scour the network for documents. God knows I found about 30% of what I have now on the network that someone else had written. I modified and updated for the times and VOILA! Some place to start...
It's funny, when you do a job for 11 years you realize everything that you learned and did comes into play. I'd never been solely responsible for a network until now, but when I walked in the door the first day I immediately knew what needed to be done. Not that I had a clue how to get it done, but that is where TekTips came in. And you were smart to come here.
Just my 2 cents...
cckens
"Not always my best shot, but I hit the target now and then"
-me