Ask Matt Roszak? He's made 5 successful turn-based RPGs now and is open to being emailed, but all 5 are parody games.

Where do I contact him?

Well, you can start by searching for his name to find one of his sites that list his email...

Edit: Weird. That herculean effort took me only twenty seconds to find this.

That's a pretty broad question. What sort of RPGs are you talking about? Are you asking about how storytelling works specifically from a turn-based RPG standpoint? Because you can write just about any story in a turn-based RPG and have it work, so long as your writing execution is up to par.

Yea storytelling part. But I’m also trying to figure out how the exploration and combat system works

This is helpful info. Thanks man