A typical progression goes kind of like this;

Start with a .40 size trainer
Switch to a .40 sport plane
Switch to a .60 to 1.20 sport or scale plane.
Get your first "big bird" and become a total big bird snob, forgetting all about your smaller planes
Auger in a $10,000 scale plane on it's maiden flight
Quit the hobby in disgust and ride motorcycles for a while
Rediscover your old .40 trainer or sport plane and how much fun they were