Accessory wiring help!

On my 900s

I have a 12" light bar, 4 led cubes, CD player/4speakers, winch, whip..

Currently have one battery and wires everywhere… Pretty sure nothing is fused or relayed… I have ordered a kinetik hc600 and isolater kit for 2nd battery and I want it rewire everything for much cleaner and safer install…. I’ve read a lot on fuse blocks… What is the best one that u all use? 6 or 12? Also what else should I need with wiring it all…

The isolater go from battery to battery, + to + and – to -,
Then run power from from accessory battery to the fuse block?
Then run wire from fuse block to switch that controls each accessory?

I could use as much help with this as you all want to give… Do I need relays? Or anything? I’ve also seen people talking about keyed power and key off power… I’d like to be able to have CD player and maybe light bar on with key off at times