Glad to have another 'Heep' driver!
Can't think of anything you 'Must Have' right away, but I'm sure there will be things you 'Want' to do later on...
This is a good place to get information, lots of experence here and only a couple of crack pots...
Listing what you want to do with your Jeep will help with the 'Suggestions',
Like do you go hunting, fishing, off road trail riding, or something like that, or is your Jeep mostly going to be a commuter?
There are some standards,
If you use tall tires, you will need to get a jack that will reach high enough to get your rubber off the ground.
We call them 'Hi Lift' or 'Handyman' jacks.
With a 4 cylinder engine, I don't suggest you put very tall tires on it! That will kill your gear ratio, fuel milage and drivability...
If you 'Off Road', there are some basic tools and accessories that you will need sooner or later, like traction aids, pull straps, hand tools, ect, but all that will become apparent as time passes.
Most of us have our own touches, like air compressors, or extra radios, or extra lights... Something like that.
Anyway, no question is considered 'Stupid' here, the only way to learn is to ask!
And welcome again!