Being close to both Lakemont Park and Bland's Park (now Delgrosso's), I think the first coaster I rode was Skyliner at Lakemont, which even in the 90s it felt like that coaster could fall apart at any time. Great airtime in the back, though.
Zyklon at Bland's Park was likely next, followed by Comet and Wildcat. Oddly enough, my first coaster with an inversion credit of mine is Shockwave at King's Dominion, which was a standing coaster followed by the god-awful Anaconda.
Sometime after that the SuperDooperLooper and Great Bear, which remains my all-time favorite inversion coaster and #2 all time.
Skyrush Uber Alles.