need some help figuring out how to set up my amps
 

alright so this is all going in my hatchy and i need help figuring out my wiring.
1 monoblock amp w/ single sub i'm connecting to the subwoofer RCA output on the deck, i know that part.
but for the 4 channel amp to 4 speakers, i'm lost. i got a distribution block to run the power wire, fused also. running new speaker wire to every speaker. on the amp, outputs are like so.

[+][-] [-][+] [A]
[+][-] [-][+] [B]

so A would be front, B is rear? and it's sorta like looking down at my car from the top, so to speak. does this mean i need to search for a deck with front and rear RCA out? does it really matter at this point if i get a high quality (watts per speaker) deck, just as long as it has RCA's for sub, front, and rear? is 4 gauge good enough for a 720w amp? 8 for a 400w amp?

also for the control/remote wire, is it alright to splice two wires off the wire from the HU?

thanks.