Hi, welcome to the German Community.
I prefer the RPG-Maker 2000, because the 2k3-Maker ist not so popular.
For a good game you need a good story. Stories with a gigantic battle betwen Good and Evil are not so liked because a lot of people used that background for their games.
You need some pieces in your story, which are new, just that way your story is something special.
Then a big part is done. Now you need a style of ressources for your game. If you use different styles, that don't interact good.
Yeah, and then there's the mapping. Most people teach themselves how to map, but there are some courses, which are pretty good.
That are the big parts of a game.

Where you can download the 2k-Maker I mustn't tell you, because it's illegal to download it. But I just say 'Google'.

I hope my English wasn't too bad.