the primary reason folks lift up Jeeps is tire clearance. we run larger tires to tackle larger obstacles offroad, and raise the lowest point, the axles, higher. there are 2 ways to lift Jeeps up, as you know. body lifts, and suspension lifts.
suspension lifts should be your main style. they are safe if done correctly, and basically involve replacing the shocks and springs with larger ones. the upside is ride quality can be manipulated for the better, and extra axle movement can be gained, leading to improved traction offroad and additional ground clearance. the downside is suspension lift mess up driveline and suspension geometry, meaning additional parts need replaced or modified to correct the issues. it also makes the Jeep more difficult to get in and out of, and it's center of gravity gets raised, increasing the likelihood of a roll over.
a body lift is just that. only the body is lifted. this should be done no higher than 1.5" to run safely, and should only be used to give a little extra room for tire clearance. nothing more is gained as these types of lifts don't actually lift anything that's going to get hit. but sometimes an extra inch is desired for the tires, so a BL is then installed.
all lifts can be uninstalled by simply popping the old springs and shocks back on, removing the coil spacers, or BL pucks. with a small amount of mechanical skill, anyone can install one. I've installed a lot, and it's really not too bad.
I like Teraflex, Rubicon Express, and Old Man Emu lifts. I currently run a Teraflex suspension lift and highly recommend it. 33's you'll want AT LEAST 2.5" of lift, but 3-4" is generally desired on a TJ for offroad use. a 2.5" suspension lift, mated with a 1" body lift, would be very economical for you to fit 33's, and would provide great clearance, and as an added bonus it wouldn't jack up your suspension geometry too bad.
just keep in mind larger tires have effects on handling and ride quality too. so any questions feel free to ask away. lots of knowledgeable and friendly folks patrol this forum, and we'd be happy to help you out, no matter how dumb the question may be. after all, every single one of us didn't know anything about lifts or modifications at one point. I think that's understood here, so we don't snap and bite newbies...much
welcome to the forum too. you're Jeep disease is about to take off. we'll help you blow every last dollar you earn