car stereo guys i need your help!

[70chevc10]

i got a new amp for christmas so i can finally hook up my sub in my car. ive never hooked one up before so i have some questions. one, what is the best way to wire a DVC sub? and also, theres the "system remote wire" thing on the amp, the instrusctions say if there isnt a system remote, to hook it up through the ignition wire. would i just be able to hook it up through the power wire to the cd player? my last question is about my cd player its self. right now one wire is hooked up wrong so every time i turn the car off all the presets get lost. can i run a wire direcxtly from the battery to the cd player and not have it drain the battery? right now it was hooked up to a "clock" lead from the old radio, but it didnt work.