Judging by the roster, I'd say that they're kinda' like this, right?:

They were released in 1990 -1991 or so by Classic Trading Card Company. They were usually sold in blister packs in retail stores. Other card companies sold their stuff in typical wax packs; in giant boxes at convenience stores, grocers and hobby shops. At the time, Classic wasn't a typical card company, as they primarily sold board games with trading cards (most famous was a late 80's set called "Boardwalk & Baseball").
These 1990-1991 sets were flooded through Kay-Bee Toy Stores from about 1990 to 1994. Then through the "Toy Liquidators" outlet stores until roughly 1996.
I tried selling a few on eBay, late last year, and got exactly ZERO bids. Don't get me wrong-- they're cool to have, but don't expect them to be valuable. The old adage holds true: "they're only worth what someone is willing to pay you for them"
But...if they don't look like that, have a plain white border and the wrestler's logo on the front, those are a bit more rare. Classic also issued a set in 1989. Those can fetch you a few bucks a piece on eBay; especially the card of "Widowmaker" Barry Windham.