A 4 gauge wiring kit will see you right as this will be ample if you decide to upgrade anything.
Also not everybody knows every piece of equipment so links always help us out so we can understand exactly what you have a bit better.
What size are the speakers and what car is it all going in?
I will put the links in for u tomo when I am at a computer. They are quality little amps if it looks the same as the one in the link. I have one of those in a mates car, they are from an era just before kenwood fell out the the game. I thought that if was a 6404 but hey ho.
So what is it that you really want to know. If you check the guides section a few people have done guides on how to wire up the amp etc. Then you just match the gain by seting the head unit at 3/4 volume and turn the gain up until it distorts and then turn it down a notch.