amp kit help

Hi everyone. First time poster, long time reader. I'm gonna be installing my first head unit tomorrow (premier p360) in my new car. I'm also going to install an eclipse amp (ea3422) and speakers that were in my old car. The problem with wiring the amp is that I don't have all the old wires that I used before. (A guy at the car dealer took out my speakers and amp from my old car while I was out of town). Basically, I have half an amp kit and really don't want to buy another one.

Here's what I need:
-4 gauge power and ground wires
-speaker wire connectors (push-in ones that connect to the speakers)
-18 guage remote wire ( to connect to hu)
-45 - 55A fuse n fuse holder for power wire

Can I get this stuff at Good Guy's or something? I tried the website n they dont have the wires. Also, would i need a .5A fuse or something for the remote wire?

Thanks.

p.s. the amp has 2 25A fuses, so the 50A fuse on the power line is ok right?