I'm pretty sure that I can wire the rest of the relays up for my lights but I was wondering if there was a good place to look for a switched supply? In addition is there any limit to how many switches I can have on the switched power supply? I have a aux fuse/relay block for all my accessories but thus far I have just wired them constant hot which I wouldn't mind fixing....but I'm not awesome at electrical stuff. I have never used a relay for wiring switches before but I know I need to do it.

Maybe I just need a little help. Here is what I understand.
Relay Diagram.png
I believe that I am going to end up drilling a hole in the firewall and routing all of my cables through there independently. There's too many already.