Dude, asking people how to make an RPG is so extremely vague it's not even funny (well kind of).
You might want to use RPG Maker XP for fun, I think it's kind of glitchy, but it probably works well for other people.
Do you have a program to make it with? Or any experience? RPG's are rather difficult to make, compared to the other kind of games you can make. Not trying to be mean, but no one can really help you if they don't know what you need help with.