Trying to hook my amp up in my car, I already have everything but the main power supply which is the wire to the battery.I was wondering how would i do that the right way?

The car amp needs to be wired using a +12 power, ground, and +12v signal (rmt) cables.  the +12 volt cable needs to be connected from the posative terminal of the car battery to a fuse (the right size should be written on the amp somewhere) then to the +12v on the amp. the ground cable needs to be connected to the negative terminal of your car battery. the RMT is the more complicated one, this needs to be connected to the header unit or the ignition switch. if you look in the instructions for your header unit (the unict where you insert CD's or tapes etc) this should explain whewre exactly to connect this cable. or you can connect it to the terminal on the ignition switch which becomes live only when you turn the key, should be the third one in. this line basicly tells your amp to turn itself on when it recieves a 12v current. you can also wire it up to a manual switch directly from the battery by connecting another cable to the posative terminal of the battery then to a switch then to the RMT terminal of the amp.