I really love aviation and I'm thinking about going for a career in air traffic control, but I can't find anything on the web that will help me learn all about it and how to perform basic operations. Is there anything on the web that I could use?
Join the Vatsim network. This is a network of simulated pilots flying X-Plane, FSX, etc., and simulated controllers. The simulated controllers use, as much as they can in a hobbyist network, real phraseology and procedures. I personally knew several real-world controllers who controlled on the Vatsim network in their off-time, and I know several hobbyist controllers who went on to become real air traffic controllers.
While controlling on a hobby network is not the same as controlling real airplanes, you won't learn a lot you'll have to relearn. That's because the hobbyist controllers on Vatsim make a serious effort to follow real procedures. When they discuss air traffic control with each other, you frequently see references to the ".65", the official bible of ATC.
You can stream the US ATC feeds from most major airports from this site. A good resource once you have some context on what they are saying.
My local airport offers (or at least offered at one point) tours of the tower. You can usually set one up by calling the phone number for the field. This is a neat way to see at least part of the working environment and possibly meet a controller and ask them questions.