A4 2.8 30V maintenance

[ricematthews]

My '98 A4 2.8 30V Avant is nearing the 75,000 mile mark.
I am planning on doing a water pump & timing belt on it soon as opposed to
waiting for the factory recommended 90k mark.
As I'm not terribly familiar with the inner workings of these motors, what
other things need to be done with the t-belt & h20 pump?  Is there an
idler/tensioner pulley like in the I-5's?  Any other items?
What other maintenance should I consider at the same time?  Thermostat,
etc.?
TIA.
-Mark Rice