The disc's flight does not change much, if thrown straight, the disc will fly straight.
Most discs tend to become more overstable at the end of their flight.
Basics - Each discs flight will vary depending on the technique of the thrower and angle of release, heavier discs tend to be more overstable than lighter discs of the same model. Suggestions - A novice or beginning player should start with a lighter, understable disc. Good luck and have fun.