I know this is sorta dead, but my recommendation is to learn how to use an engine like rpg maker or game maker for example and then go from there. For example, if you choose rpg maker you should start by learning how to use the program’s basic, then how to make custom sounds and graphics and then the scripts/plugins or how to download them and use them. It takes some time, but that’s how you do it basically. I wish you the best of lucks. And as a friendly adivce, you shouldn’t rely on engines made for a proggram since that ussually ends up on problems if the person who made it decides to cancel support or he doesn’t finish it.