I bought my wire and female quick disconnects from Happs. The crimping and stripping tools I bought at Home Depot. I used 22 gauge wire. Go to Happs site and search for part number 49-1207-00. You could probably find the wire cheaper somewhere else, but I was ordering a bunch of stuff from Happs at the time, so it was just easier for me to get everything at one place.
As far as organizing the wires, I just used 2 different colors, balck for ground wires and red for 'hot' wires. And I used plenty of cable ties to keep it as neat as possible.
The wiring really isn't very difficult, just a bit time consuming.
Good Luck!