electric problems

Hello guys, I own a Mercedes A 140 W168 and i want to install a 4 channel TRF M600.4AB amplifier (600 watt RMS, 1200 watt max) and connect to it a 12'' TRF VLSW122D2 Subwoofer (250 watt RMS) and 2 additional speakers on car's shelf (85 watt RMS each). So the music will be performed by 6...