How did I get into Masked Rider? Well . . . I really loved The Super Inframan (which was inspired by both Ultraman and Masked Rider), when I first saw it back in Spring/Summer 1984, when I was nearing 9. I was totally hooked! Then, I became aware of Masked Rider himself about the same time I became aware more of Ultraman. In the second half of 1987, I went to NYC's Forbidden Planet (the defunct one on 59th Street), and, to my ecstasy, saw tons of Godzilla and Ultraman toys as well as toys of this strange buglike Inframan-looking guy! One of them, a totally sleek armor-skinned guy, was called "Black" in English (it turned out to be Masked Rider Black)! I think I saw the other Riders, mostly 1 & 2.
I also read about "Masked Rider" or "Kamen Rider" in several magazines, even some issues of Akira (the color ones by Epic) made references to him in the commentary pages (when mentioning Shoutarou Ishinomori), until finally, at NYC CreationCon on the first week of January 1991, I got Markalite Vol. 1 in the dealers' row (I also saw the beginning of a Masked Rider Black episode in the same area, and I was totally hooked!), and there was no turning back. I didn't see the first Masked Rider until Christmas Day 1996. I truly became a fan since.
But anyway, how did I get into tokusatsu? COME ON!!! I've been into tokusatsu ever since watching Godzilla Vs. Megalon (not only the first Godzilla movie I've ever seen, but also the first movie I saw in theaters)! As my childhood progressed, I watched Godzilla films, Gamera films, daikaijuu eiga and other tokusatsu movie classics, and the moment they came on TV would totally light up my life that day. And as my adolescence rolled on, I began to see more superhero shows! Thanks in part to my involvement in sci-fi fandom, specialty stores, sci-fi conventions and video dealers there.
Incidentally, it was also Jet Jaguar (the robot from Godzilla Vs. Megalon) who got me into Shogun Warriors toys! I always thought he looked like a cross between Great Mazinger and Getter Dragon (Getter Robo G). The Shogun Warriors were, and still are, my favorite Japanese robot toys.