First thing you need to do is spend some time reading here, you will find more things you want to do to your Jeep than most of us can afford, or have time to do in a lifetime!
There are lots of threads about different seat covers, pros and cons to most... also tons of info on soft tops. If you want a Sunrider (that's what they're called) you need to look at Bestop. Most vendors carry Bestop products, the Sunrider top is the one that opens like a sunroof. You will need the appropriate hardware for one which your TJ may or may not have, depending on what year it is. I think some of the later ones came with the sunrider option. You may luck into finding a used one on Craigslist or ebay, if not JCWhitney, Quadratec, 4WD Parts and tons of other vendors carry Bestop products.
Post up some pics of your TJ, we love pics! Don't forget to wave!
I have a 2000 TJ and I successfully replaced my radio with a new unit, but I had the help of a repair manual... with pictures. There might be a braket attached to the back of the radio that was a pain to get at. A good repair manual will save you lots of headaches.
Bigger tires / wheels (after a lift).
Better front brakes (after bigger tires)
Rear bumper with swing out tire carrier (needed after bigger tires if you have same size spare)
Winch on front bumper
New Front bumper
Viper engine replacement.
Rocker panel guards
Dude...Just pry up the defroster vent (really easy)...Remove the 2 screws on the top of the center console (i.e. the trim for the climate control and the radio) then pull it off. Only clips are holding it. The rest is obvious. Good luck.
theres a screw behind the ashtray too. Don't just rip it off without all screws out.. or it wont go back on and stay on. Do you have any mechanical knowledge? Youre asking pretty easy questions that you could go in your garage and look at it and figure it out dude.
If you are interested, I have a kit for sale (that will appear in JC Whitney next spring) that converts the original TJ top to a sunroof. I have it listed on Ebay under Wrangler sunroof. Feel free to email me if you have any questions. Thanks!
Any question you could imagine has been answered at least five times.
On seat covers I recommend looking on eBay at a brand called iggees. They are synthetic leather(vinyl). So water resistant. And look better than the just about anything. Also a member her "infernogirl" sells seat covers that look good and can be made more custom. So u might PM her regarding those.
Good luck and enjoy the jeep. They are unlike anything else.
I ordered the Bestop Sunrider from JC Whitney, had a $100 off sale plus free shipping! Love the top so far, very quick to flip the top open or closed for sudden showers. Many people claim it is too difficult to install, however my brother and I did it in about 2 hours.
Ebay is a better place to look for Jeep accessories than you might think. I have a 2000 Wrangler sport and got my metal "half" doors on there already painted the correct color in great condition. Can do some bartering and swapping on there sometime....