It depends on your intended usage. A mall crawler can have more lift with less suspension mods. Because it doesn't need to flex when you're winching over those dangerous curb stops in the lot.
Lift kits are sold as anything from "here's a couple pucks" to complete kits with springs, shocks, bump stops, steering components... you will need to read. Obviously, the cheaper the kit, the less it will include, and the less capable your end result will be.
If your Jeep is a Rubicon, you can generally count on a 3" lift, in conjunction with the high clearance fenders on the Rubi, allowing you to run 35" tires. But you will have some rubbing if you flex it off road. If it's not, you will likely need more than 3", especially if you don't want rubbing. My wife has an '11 Rubi with a 3.25" Rough Country lift and 35" Toyo Open Country M/T on RockStar wheels with 4.5" of backspacing. She rubs on trails. Mine has a 5" RC lift. No rubbing.
If it's a Rubicon with an automatic transmission, you probably have 4.10 gears, which are borderline. Since the '11 engine isn't a powerhouse at 200HP, you will probably want to go to a 4.56 gear. Especially if you want to be able to drive on the interstate. Indiana doesn't have much in the way of inclines, but still... My wife still has the 4.10 gears, and it's ok on the interstate, but just barely. I have 4.10s and the M6 in mine, but it's a 2013 with a few mods, so it makes about 50% more power.
If it's not a Rubi, running 35's on the highway will make you cry.
You will also need new wheels. Some people use wheel spacers because they're cheap, but I am not a fan for various reasons. The stock wheels have about 6" backspacing. You want to drop that to about 4.5".
You will need to get something like JScan and a compatible OBDII dongle to recalibrate your speedometer.