My first week at one of my first instructing jobs all I did was hang out at the airport and sold it to whoever walked through the door. The first few weeks are rough but over time you'll build up students. Then, when you have students, you'll be at the airport as it is just working... picking up more students while you're there. Tough at first but it starts to pay the bills. Every day I learn that instructing is a good chunk of paying your dues in more ways than I could have imagined... just keep at it and bring some homework for the downtime.