If you use that fuse block you do not need the first item listed. In fact, I wouldn't use that first item listed at all. As for where to mount it, just find a place in the engine bay that is up high and dry, probably on the firewall. You are probably going to want it mounted to the same side as the battery to keep wire runs short, so try to find a place on that side for it.
For a wiring diagram, you can reference this:
You need two relays, two switches, and some wire, in addition to the fuse box you have listed.
You can buy a pre-built harness which saves a lot of work and could also be cheaper than building your own. If you go this route you are stuck with whatever switch comes with the kit and it may be worth it for you to piece together your own harness to get the switch you want. For a pre-built kit, search around for an accessory light wiring harness or similar on Ebay
You will need a 12v rocker switch for each circuit (2 total). Many people like the Daystar switch but any rocker switch will work:
You then need two relays. I would recommend 30amp relays even though you dont need that much power capability. They are common, cheap, easy to find, and reliable. Here is a 5 pack for $5:
Now just get some 12v wire and wire it all in according to the diagram.
Hopefully that helps.