Wheel and tire fitment fitment

I just purchased my first Z . It’s a 1988 5 speed turbo with 65k miles. I’m wanting to get some new wheels for it but with all the reading I’ve done I’ve learned that it’s not just as easy as buying a set you like lol . I’ve always driven a truck with big tires so when it comes to putting wheels and tires on that there’s no question. But when it comes to this car I’ve seemed to run into some troubles . I would really like to get some 17” or 18” wheels . I really like the flush to the fender and not much gap between the top . The car I put a picture of is perfect. I messaged the owner about his set up but he never answered. If anyone could give a green horn a little advice I would appreciate it . Thank you in advance.