John take this from someone who has spent the past 6 years of their lives working in sales, honestly, don't bother going to the Interview. I'm going to assume it was advertised as "GRADUATE DOOR TO DOOR SALES URGENTLY REQUIRED, NO EXPERIENCE NEEDED" with a ridiculously over the top earning potential. Yeah, no.
That earning potential, as it has already been mentioned, will more than likely be minimum wage on the dot, maybe even less because the law with minimum wage when earning commission defends the employer, not the employee.
Secondly, door to door sales, is the ****test piece of **** to ever wipe itself on our society. I promise you, without any shadow of a doubt that you will wish you hadn't have gone to the interview. Trust me when I say, you can do so much better.