headlight accessory wiring

I'm working on a '94 Chevy Suburban 3/4 ton with a 454. Now, i understand the basics of wiring and most of the principles behind it. But i'm lost with where i even begin for this:

Question 1: just purchased a pair of new headlights. in addition to your ordinary hi/low beams, there is a led halo around the high-beam (containing 4leds per halo, 1 halo per headlight housing) and a soft ambiance type of buld hidden off to the side to illuminate the high-beam housing.  So here's the question: the halo is powered by 2 sets of wires (12V+ and a GND) for each headlight and the smaller light has a 12V+ and a GND. I'm wondering if i can use a junction bar to pair up the halo's wiring into one wire to run to modular fuse box i purchased (box from sierra marine, mdl#: FS40740) which i'm assuming i can. problem is i have no clue what the draw of those 4 (8 in total combing both headlights) LEDs would be (and why they even wired it with 2 sets of 12v+ and GND to begin with) and what size fuse i would need to use in the box. and ditto for the draw of the smaller bulb. i want to be able to turn on the halos and mood bulb(?) seperately using 2 switches.

Question 2: How exactly should i go about wiring the bus bar (also from sierra marine, mdl#: FS40750)(bus bar for other accessories already on truck - all of which are connected directly to battery terminal at the moment)  and fuse box (i'm going to be mounting them on thick HD plywood that'll be painted for flame-retardance). I know that they obviously need a 12v+, but do they need to be fused for either of them? secondly, do they also need to be grounded? and about those other accessories already on the truck, can i just wire them to fuse box, and using the correct fuse there, cut out the inline fuses that are scattered all around?

I realize that's a lot to process, but i really need some help. so i guess what i'm looking for is maybe someone who can explain to me what i need to do with all these wires and the jungle of them thats already under the hood - brother's handywork - (and why i need to do it so it makes sense to me) as well as possibly draw up a diagram/schematic so i can see what the heck i'm doing (visual learner). Any other advice/information/tips/ideas would be great and thank you in advance for taking the time to reply.

P.S. - Absolutely love the site! It's helped me with countless questions i've had over the years!

ok im not sure of this bus bar...but here is what i would do....conect the positives with a 5 amp fuse ( leds use very little power } or 2 amp   and run the grounds to the switch.    each ground to the switch you will use for that light....and the other side of switch to ground

hope this helps.....xs