REQUIREMENTS: Worldguard & Worldedit. Move the plugin into the plugins folder, and it will generate the default configuration. At first it will generate errors, but don't worry. Create the regions in the right place, check that the start, end & checkpoint cords are pressure plates (any). You have to set spawn location in the configuration file to your server's world spawn. If you have finished setting it up, restart the server and thats it.
You can choose a course via command or pressure plate. When it starts you will receive a set of blocks that are topped up. The course limit is what you want.