Don't know, help please

I'm not too sure if I want to write another story based off the Idea that I have or try to get an RP started from it. Here's my idea, what do you all think I should do?

The world of Digimon is a vast place; just what troubles are there back in the digital world to have to call new digi destin’s to save both worlds once again. With the help of the legendary Digimon spirits can they actually so it?

It would be for Digimon Frontier because that's my favorite out of the digimon series. What do you all think I should do though. I'm not too sure what to do. I wouldn't mind making a fanfic out of it, but I also wouldn't mind making it into an RP, I'm so confused on what to do, help me please.

I also want to make a Shinzo one too, but again I'm not too sure if I want to do a story or make it into an RP.

Sinzo is now a thriving place where humans and Enterrans live together, somewhat in harmony. But there is a new evil a foot trying to destroy both the humans and Enterrans, now will the humans and Enterran’s be able to team up to save their world?

End