before i give any advice just wanna get a little more info.
Did your cycle complete? (ammonia, nitrite are 0)
have you done an initial large water change at the end of the cycle? (20%)
If you've done the above then this is what i have to say:
as far as "regular maintenance" it's really going to depend on whats in your tank. The only real reason to do a water change is to replace consumed trace elements (consumed by corals/algaes etc) or if your system is running high in Nitrates.
If things are running good, I wouldn't do more than a 10% change every other week or so. again, it really depends on how your system is running.