Hello everyone, noob here. I've done a couple of websites that are just graphic heavy.Those are pretty easy (I'm more of a tech then designer.) But now the company I work for wants to create a website for our remote users that has our company software available 24/7. It's mainly proprietary(sp?) software so we need security and they want to create individual user accounts for roughly 1000 uses. This will probably hosted on one of our servers. What software will I need for the user accounts? What will be some of the possible problems? Any suggestions? Any help, comments, and suggestions are greatly appreciated.

The project is in it's planning stage so we have sufficient time to learn the software and install/test everthing.