TS CAL

OK, I'll take a shot at your question. If you want to use terminal service only for remote administration and the only people connecting to the server will be members of the Administrators or Domain Admininistrators group, you can enable Remote Desktop on the server. This way you don't even need to install Terminal Service and fiddle with the licence. To enable that, just go to Start -> Control Panel -> System and on the Remote tab, just check the box Enable Remote Desktop on this computer.

For the CAL part of your question, TS CAL are different from regular CAL. I presume that the CAL you bought are normal CAL. These CAL will allow 10 devices to access file shares, your database server, or whatever other service you installed on that server except Terminal Services. TS CAL are mostly needed when your clients will be running application directly on the server as part of their daily job. It's often seen in a secure desktop corporate environnement. But my guess is that youi don't need the TS CAL if it's only Remote Admin.

For the file sharing to be fully licensed, you'll need as many CALs as there are computers accessing the server. Right now, you have 10, so your covered if you only have 10 client computers on your LAN. For your database, my bet is to look at the system requirements to see what you need.