Simply use a Rock N Lock Side flashing to secure the side of your corrugated roof. This will not only create a professional finish but increase the lifespan of the roof by protecting the edge from the elements. In addition, Installing a Gable Rock N Lock Flashing is very important on a corrugated plastic roof to protect against wind uplift.
When your roof finishes up against a side wall you would use the Rock N Lock Wall Flashing to seal against the wall.