Just bought Stereo Equipment

[stantheman]

Recently, a close friend died. He requested I take the stereo out of his driver and put it in my 68 Chevelle. The car was sold and the new owner asked if I would consider a gift card from the same place my friend bought his stereo equipment rather than rip out the stereo. I figured my friend would have approved and bought the following: Kenwood head with all the bells and whistles 50w x 4, Kicker 6x9 for the back, 6 inch kickers for the kick panels, and a Kicker sub. I have a amp that will work. I'm used to the old way where you just hook up speakers to the head. Can I hook up speakers AND the sub through the amp or just should I hook up the sub through the amp and hook the regular speakers through the head? The amp is a MTX Thunder 4160 at a peak of 200 watts. My speakers run from 150-250 amps. What should I do?