You got the exact wiring kit that I got from etrailer. Its a good kit. You will need to run that + 12 volt all the way to the battery though. I ran mine under the Jeep in the same brackets the brake lines run in and put it in wire loom. Make 100% sure to keep it away from the exhaust.
You can also run it through the inside but I found it wasnt long enough. You could always splice in some extra wire though.
Also, if youre needing the 7 pin connector for electric trailer brakes(reason I got it) there is a wire ran from under the dash on the drivers side to the connector that you will be hooking your wiring kit into in the back of the Jeep. It should be a blue wire and has a tag on it under the dash that says BRAKE.