It's good to get a jump early. I usually wait till I have 2-3 secondary poking out. Maybe 3+ weeks old.
First I'll remove these leaves and expose all growth. The first set of leave I leave alone. #2-3 I remove.
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The idea is to guide those secondaries into all opposite directions away from the main. It'll form a nice base for the floater in flower.
It's important to get that main stem at a 90° angle. Easier to do with a young plant. Lots of crushing n bending for an older one.
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It's cool your attempting the training. You'll learn a lot as ya go. Once ya get that picture in your head of what you want to accomplish it becomes super fast n easy.