You never know what your first booking is going to be. Karlie Kloss was scouted at a mall show, and a few weeks later, she was walking for Calvin Klein. This doesn't happen for everyone, but whether you've been modelling for 2 weeks or 10 years, that pivotal moment could happen at any time. Being ready for that moment when it arrives, that's what it's all about.
Luck favors the prepared.