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Hi,

There are some general information on how to use the level editor in the user manual:

https://drive.google.com/file/d/0BwSDHIR7yDwSelpqMlhaSzZOa1k/view?usp=sharing

Here is a video that includes some of the basics of track design, watching this is a good place to start:

And here is a short timelapse of a level being built from scratch that might give you some clues:

The easiest way to get started might be to edit one of the included maps - start by just moving things around, deleting or adding some objects etc.