Ideas are priceless, In other words they are also worthless. CONTENT, can be given value and sold. Make CONTENT; art, code, sound, or levels. Levels if you want to design a game experience.
Makes mods! Even with no "practical" content creation skills you may be able to get a mod team together of semi-skilled people and begin on your game. That process enough will teach you a huge amount and will either make you or break you.
I've got 19+ game ideas that absolutely would be best sellers. And I actually know how to make games, doing it as a profession for the last 8 years. Many are documented, and some even have some minor bits of content created for them (concepts, models, textures, etc.). ... Of course so does the guy next to me. I'm going to…