Well WELCOME to the 4x4 world and even more to the JEEP world . Make sure you do a search for info about the Jeep Wave. Kind of like the motorcycle wave.
There is a great group of folks here and they are more than willing to offer advice and opinions when trying to figure out a issue or trying to decide which set of mirror dice to get.

Part of deciding on what to do with your TJ is sitting down and deciding on what you end game plan is. It might change along the way but it is always better to have a goal. So like others have suggested, drive it for a while before you do any major mods to it. Enjoy the open top and since it is your first 4x4 think about joining a club.
PNW4WDA is a good place to start. They have a map that shows each region and then a list of clubs in your region. Being in Vancouver you are close to Tillamook State forest which has some easy to hard trails in it. There are other areas close to you to do some wheeling also.