(Basic) CMS Question

Hi there - posting this question for web guys who know a thing or two about the architecture of Content Management Systems.

Here is what we have to do - we're going to be giving a number of videos with a bunch of different tags (male, football, age range, etc.). When a user signs into our site, we have to match that user's demographic (which we will separate out into tags, so that users will also be tagged) to potential videos' tags so that we can display an appropriate video.

On top of that, we want to rotate videos - if a user's tags matches him/her to 10 potential videos, we want to make sure we're showing him/her something new each time - so we have to keep track of which videos have already viewed (or haven't been viewed).

So yeah, any advice for the best way to design/build this sort of CMS would be great. Thanks all.