You don't need to--and shouldn't--do anything until you've educated yourself about this stuff.
There are myriad options for mods like lifts, wheels, and tires, and they all can significantly affect your Jeep's geometry, performance, and safety. Properly selected and installed, you'll be very happy, will spend what you expected, and will enjoy it for years to come. Improperly selected or installed, and you'll be unhappy, will spend way more than you expected, and will hate your Jeep. You may even render it "unsellable" because it's so dangerously and improperly modified.
The chances that you--knowing basically nothing--are going to get it all right by picking items out of a hat at this point are basically zero. There are too many options and preferences to go off of what other folks say they like or has worked for them.
Leave your jeep as is and find a local jeep group to go offroading a few times. Spend some time on this forum searching and reading. Go to Quadratec.com and order their free catalog to look at a large variety of the types of options available. Here's a good thread
that has lots of simple DIY mods that should help scratch your itch to mod without messing up your jeep.
I would not mess with lifts, wheels, or tires without having a basic understanding of terminology, how it all works together, what you want out of your jeep, and how much you're willing to spend. Others may advise otherwise, but I can't see how you'll go wrong with just waiting a while and educating yourself.