Exporting Smaller Quicktime

Ok, I have a short animation about 3 minutes longs and I want to export it as a quicktime. It all works fine but the file size is massive, a little too large for my liking. What is the best way of compressing the quicktime movie? I’m planing on posting it on youtube. I have no idea what all of the compression options mean so your help would be fantastic.

Please have a look here:

http://www.lafcpug.org/Tutorials/basic_you_tube.html

Cheers
Nolan