My first proper coaster was the kiddie one at Pleasure Island circa 1999, but there's a photo of me on a fair one dated 13/07/98, so I guess you could say that was my first. No idea where the fair is or owt though.
My first Rollercoaster was The Runaway Mine Train I think! My first coaster with an inversion was Air! I rode The Mine Train at like 4 or 5 years old! And I am only starting to step up to the big rides! I rode Air this year at Scarefest in the dark and it was awesome! My next big rides are Nemesis and Oblivion!
First roller coaster was probably the flying fish, back in the day, I'd say it must have been 1992, 1993ish. Makes me sick what they've done to that classic now, dumped it behind Depth Charge like some used condom!
First inverted roller coaster was The Corkscrew I'm please to say, or it may have been The Looping Star at Dreamland Margate, I can never remember.