What happens next?

How to use an offset smoker
Season the smoker if necessary.
If you're using a new offset smoker, wipe down the entire smoker with soapy water. Rinse the smoker to wash away any dust, grease, or shavings.
Let the smoker dry and then spritz vegetable oil over the inside of the cooking chamber. Open all of the vents on the smoker and light a fire in the firebox.