That year are the last of the 5th gen w-body Grand Prixs, which were also the last ones to have L4 engines or 5 speed standard transmissions as an option.
There's not as much info on those as there is for the 97-03 and 04-08 generations on this forum, but there's definitely enough to help you with just about any question you might have.
If you can give us more info, as in what engine it has, what trans it has, how many miles, etc... We can definitely give you some advice on maintenance that it might need or certain systems that need checked more often than not due to common problems.
Just keep in mind that it's a 21 year old car, it's probably going to have some issues.