I don't disagree with fundamentals of changing all the key driveline fluids, flushing the brakes.
If you aren't super familiar with the TJ platform, it's not a terrible idea to take it for an inspection at a good mechanic who is. A post purchase inspection I suppose you'd call it. If you told them your priorities ie safety, reliability, comfort, performance, whatever. Then they could probably give you a better list and priorities, rather than us throwing your money at it. Maybe don't mention you plan to do it yourself.
Just sayin.