Pretty much goes into about 90% of the stock locations.
You might have one or two branches that don't quite fit in the exact spot under the dash or in the engine compartment, but you can certainly still use the stock routing as your map and starting point.
If I remember, only the two outer firewall holes get used. The ones behind the engine valve cover would normally get covered up.
If it's a '71 and later that is. If it's a '70 or earlier, you only have one factory hole in the fender well area. So you'll have to drill a new one and enlarge the other one.
The two rectangular holes behind the driver's side valve cover get covered up.
Flasher and turn-signal relays usually just get laid out wherever they fit. Not on long enough branches to get anywhere convenient it seems.
One thing to think about now too, before you have it installed, is whether or not you're going to be using an upgraded alternator. If so, and it's rated at over 70 amps, I would pull the large Yellow "Bat +" wire out of the passenger side loom, route it to a more convenient spot and attach it to a new distribution block in a convenient and out of the way spot on the fender.
If you do that, you can use it as a convenient power point for heavy accessories. Otherwise, you just have to figure out a way to deal with it wherever it is near the battery. And that's a busy spot on most Broncos.
If you're using a smaller alternator, then just go ahead and use the Yellow wire as the output wire for the alternator. As the instructions will tell you to do.
Good luck. Sorry no pics, but someone might be able to help there.
Oh, and it helps that the weather is good, as a nice warm harness is a nice pliable harness. So leave it out of the box somewhere that's warm, but not in the direct sunlight, before you start the installation.
Paul