i have a 1996 maxima. where are the stock amp locations for the front speakers? are they on the back of the speakers?

Yep, they're right there with the speakers.

will i have to run new wires if im installing aftermarket comp speakers?

If you just want to install a HU, you can get an adapter from Crutchfield or wherever.

If you're installing new speakers anyway, you can just use the pre-existing wiring harness, just match up wiring colors both at the HU side and the speaker side. You could install new siring if you wanted to, but IMO no real point to it.

i bought the HU and it came with the wiring harness. and i bought the comps already. so i can just use the old speaker wires instead of running new wires?