Help with In-Wall Ethernet Ports

What do you mean by main line? If I were to conenct the router WAN port into an ethernet port on the wall, what would I have to connect to the patch panel for it to split into the rooms connected?

Also, if I were to connect something into the WAN port on the router, then what would be connecting the router and the modem as they are connected by the WAN port.

But if you have a modem separate from the router, instead of a combo unit, then plug the ethernet cord from the modem to the WAN on the router. You then need to plug the correct cord that goes to the room where you want internet at the ethernet port from that mess of spaghetti (I did see labels!) into a LAN port on back of router. That will at least give you internet access on that single port in the room where the computer is at. That gets you up and running, the rest is just tracing back which line goes to where and hooking them up properly.

There are inexpensive devices you can use to locate each port. Google "cable tester LAN" or "Network Cable Tester". Considering the lines you have there, I'd urge getting and using one.

Okay.
I understood everything but this sentence: "You then need to plug the correct cord that goes to the room where you want internet at the ethernet port from that mess of spaghetti (I did see labels!) into a LAN port on back of router."

So, if I am correct, I just plug an ethernet cable from the LAN port of the router to an ethernet port. Then, in the comms box, I just connect certain rooms cables and it should work? Do I need to connect the cable from the port that the router is connected to?

I just tried connecting the router and then trying out random ports that I saw were already connected and it didn't seem to work, so what am I doing wrong?

Also, just to clarify, the router and modem are not near the closet, I'm just connecting a LAN port to an ethernet port in the wall.

first determine a live feed goes from the router to that junction box, which means find it. You can then use a pass through coupler to hook direct to the cord that goes to the room you want. You need to determine if you need male to male, female to female, or a passthrough male/female, depending on what the cable ends are in the box.

Also consider, there's no guarantee they've even used a conventional setup for the cable ends, but hopefully.

Ohhhh.
So if I understand correctly, I find the cable that correlates to the one that connects to the router LAN port and the one that I will use for my computer and then just connect the two with a coupler in the comms box?

Also, sorry for being a little tedious, but I can't find out which label would correlate to the the ethernet port connecting to the router. For the bed one I can just test all the bed ones but I'm not sure what the bar/counter area would be called.

http://imgur.com/a/qla5U
The circle is the port and straight to my right is the front door.

As far as the labels go, I got
BLUE CABLE
Bath master
Patio
Master
Bed 2-5
Antenna
Front door
Study
Kitchen
Family

YELLOW CABLE
KP front (not sure what that means)
Family

"I find the cable that correlates to the one that connects to the router LAN port and the one that I will use for my computer and then just connect the two with a coupler in the comms box? "

Yes, correct.

" I can't find out which label would correlate to the the ethernet port connecting to the router."

Is there a label where the LAN port exits the router to go that way toward the junction box? Finding it in the junction box would be easy if you are using laptop and just plug into the possible ones till you see a connection, then you know which one it is. You then put the coupler on it and hook to the cable to the room and the wall plug will hopefully be live then.

Always remember, anything could be messed up with the system, defeating your efforts.

Probably for a keypad cable, maybe one that allowed control at the "front" for the entire system, or if there's an alarm system that was in there, probably to the one at front entry.

Oh, and a few unnamed white ones.

....coming from the router, especially if several LAN ports on it are used already. What color cord's exit the router?

I also found pantry.

But as you said before, don't I just need a coupler rather than switches because I'm only trying to hook up one ethernet. The only problem I have right now is figuring out which label corresponds to the port in the bar/counter area.

If you have some kind of network switch or even a router with Ethernet ports, you can connect it to one end and a PC or any other Ethernet device at the box...or vice versa. You'd need to make sure that no other device in the house was connected to any Ethernet port. Your router/switch should have LEDs that light up to confirm a hardware connection. This may mean running up and down stairs until you get a hit. There's also a loop-back method but that requires tools and, minimally, a DVM.

Instead of going back and forth, can't I take my laptop to the box and try every single cable there until I get an ethernet symbol on my laptop, instead of checking the router?
Once I find the the cable that goes to the router, I'll then just buy a coupler and find the one in my room.

I was looking at that picture again and it had some alarm or door answering system, so further fell the "KP" labeled cords are part of that, or what was there at the time.

to locate where any cable terminates in the box or elsewhere in the box. You do what's called a "continuity" test. Presuming all of your Ethernet cables are wired as industry standard 568b, connecting a powered device designed for that cable at both ends should light up an LED...usually green...if the connection is proper. Baring that, you're stuck with using a loopback connector at the far end and a DVM at the other if you don't have the expensive fancy equipment a professional might use.

I found the cable that comes from the router... Now I'm trying to connect it to all the "beds" to try and find my computer.

Find the main line coming into the box for ethernet from the router, and couple it to the line for the room you want the internet into. All those RF cables are probably for TV in every room and you can ignore them for this, just look at the RJ45's.