Welcome!
Your Z will need a lot of attention from what you wrote, they need the 120K service which is timing belt and tensioners, water pump and cam seals and radiator service including hoses. You will want to take care of the leaking valve covers, but which is a major job and would benefit you to do more when doing so such as injectors and harness for best results.
These cars are expensive and difficult to find anyone to do good work on, and a PITA for DIY so be prepared for repair costs at and in excess of your cars' value, and/or some really fun weekends doing some tedious work!
Welcome to the club!
