how have you been wiring up multiple lights?

i know i can search, and i will end up searching later today, but i do not have time right now and wanted to get a probe out there to see what you have been doing for wiring up multiple lights....

i currently have some PIAAs and Hellas set up



i have the PIAAs wired where i can have them on anytime the truck is on and the Hellas are on an on-off-on switch where they can do the same as the PIAAs or some on with my high beams...

i am looking to install some more hellas as back lights, most likely grabbing some lights for under my future sliders and also planning on installing some bed lights....

my questions are:
#1 how can i prevent a spiderweb of wires in my engine compartment?

#2 should i get another fuse box?

#3 any suggestions on a switch setup within the cabin to keep shit organized?

#4 is it worth getting a dual battery set up?



and like i said before...yes i know...USE THE SEARCH!! but i can't right now to pull in all the answers i need, so if you want to drop some knowledge..thanks, much appreciated...
if you want to tell me to use the search function...