i wanna get a class d amp and 2 12" subs, will any sub do or does it have to be one that can work with the mono amp?

Class D amps usually work best at 2 ohms, so two 4- ohm subs wired in parallell will work just fine.

thanx, so if i wired them in parallel would that make them any weaker? as in bass loudness, also how do you wire them in parallel?

no....wiring in parallel will have your speakers run at 2 ohms so your amp will be putting out more power

It's actually a better way of wiring your subs than just though channel to channel