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Hulk Hogan 's son, Nick , made a heartfelt speech ahead of the wrestling legend's Real American Freestyle league's debut event ... saying his father put everything he had into the organization -- and he will make sure his vision is seen through.

RAF -- which launches Saturday night in Cleveland -- was one of the Hulkster's newest endeavors prior to his death last month ... and in a press conference leading up to the action, Nick said Terry Bollea truly loved the product they built.

"My father was so excited about this business and about this sport, and he believed in all of these athletes and the future that this league has," Nick said Friday. Instagram / @nickhogan

"My dad, Hulk Hogan, will always serve as the commissioner for this lea

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