i want to give a try at making stages, but i dont know how D:, please tell me about a tutorial or something like that
there isnt something for "start from zero"?
Well you need to start from a stage as a base. Unless you mean building from scratch. Then there is no tutorial for that. Besides it's all just importing models into an existing stage.
If I was you, I would try changing the background of a stage, such as putting the moon of the mansion in another, like final destination. While doing this, you will learn some and then you will be more prepared to make new stages.
But before you try to create, better try to modify.