Go to tearstone.com, and find the service manual for the cooling section.

 

Welcome to the club! There's a forum on this site called "Eclipse Garage", and there's a how-to guide there for changing the V6 timing belt. That will help explain most of the disassembly process, since you have to remove the timing belt to get to the water pump.

Between the forum here and tearstone.com, you'll find most everything you need.

 

Try searching Youtube for videos either using Eclipse or similar platform (Galant, Sebring, etc)