Service intervals and what/when to change?
 

When to change belts and water pump.
Tensioner and all that, is there a list of mileage and then what to change at given mileage?

Just want to make sure I'm keeping her in good health.

Currently on 74,000

Most common given is 120,000 km which translates to 75k miles either without age limit or 5 or 8 years depending on model/engine so you are right where it needs to be changed at 74k

PS, that's for the belt, no given intervals for tensioners ect but it is commonb is to change everything at the same time due to labour costs if you happen to need to change something soon after. If you are doing the job yourself and want to keep it on budget then can do just the belt. I would also recommend to do the damper as well. I have changed just belt on mine at 125k, not sure if it's been done before, then belt and damper 3 years, 9k miles later. Rollers were inspected, cleaned and packed with fresh grease both times as I was doing it myself