a tutorial on "how to make an RPG" will only result in a lot of similar games and just a little learning. I don't think this is the right way to go.
Start by researching, try to find out what other people have done already for this kind of genre, look for .capx files and see how it's done. There's no magic formula to create an RPG or any other kind of game. You must create your own formula, your own workflow.
Then, when you're ready, start planning it. Try to make a list of things that you want in your game, and try to find out how to turn those things into reality. Also, play other RPG games. You can only create a game when you KNOW how that kind of game is supposed to be.
Work hard and good luck!