If you are going to respray the entire car, i would say if it still has the original paint leave it and just 80grit it and prime over. If it has more than one paint job strip it.
3 coats of a high build primer makes it easier to get good results for first paint job(2k primers are good) this will help get a good smooth coat if you do a good job wet sanding
Base coat i would use a ppg.
Then do a clear coat. I do two passes so i can wet sand it, especially if your new and you don't have a good paint booth.
If you aren't painting right away keep an eye out, in 2 or three weeks im doing a diy for begginer painters