Thinking of making a pony game.

I've had an idea for a game based on MLP:FIM in my head for a long time. However, I've literally never made a game in my entire life. I've played plenty of games and such, but I've never actually made a game. The question is, what would be the easiest way for someone with no experience to get started? I know there's tutorials and all, but I'd appreciate some tips.

P.S. The game, if it ever gets made, is going to be a horror game.