Resetting that maintence-required reminder isn't the same as resetting the ECU. You don't need to reset the ECU unless somthing specific is going on, like check-engine lamps. Take a look at the maintenance schedule in the owner's manual & look for when most of that stuff was last done.

Reset maint.req. lamp (1998+):
- Turn off the car
- Press & hold the odometer-reset button
- Turn key to 'ON' while still holding that button
- Continue holding that button for about 20 seconds
(lamp will eventually flash a few times & go out)

Reset ECU ('98-'02):
- Turn off the car
- Remove fuse #13 from fusebox in right-side of dashboard (near door hinge)

There's not much to do for your car, other than fluid changes.
- Get new engine air filter & cabin air filters.
- Get fresh brake fluid every 2 years.
- Fresh antifreeze every 2 years, except factory fill should last 3 or 4.
- Spark timing is not adjustable.
- Adjust valve clearances "whenever they make noise"(?!?)
- New spark plugs at around 100k miles?
- New timing belt at around 90k miles?