The Plugin Site

I'm what some people call a 'Newbie'. I believe what I want is a 'Plugin' manager. What I want to do is manage the large number of plugins I have to reduce the number that are actually available at any one time. Where would the best place to get a 'tutorial' on how to setup and use a Plugin manager?

See
http://www.thepluginsite.com/products/picopro/index.htm

Also have a look at
http://www.icnet.de/