How to Make a circuit on complete mode

I'm trying to make a circuit on complete mode but i don't know how to do it can somebody help.

Well, you have 2 choices for create a complete track :

1. Take a link like this and build the map with walls, offroad...
https://static.wikia.nocookie.net/mario/images/1/14/MSS-Maskass.png/revision/latest/scale-to-width-down/250?cb=20190608171218&path-prefix=fr

2. Do your own map and use a drawing software like Paint.net.

But you should check this : https://mkpc.malahieude.net/topic.php?topic=739

Alr Thanks