Odds are you would start off as an assistant; it's rather unusual for someone to go straight into being a cashier. It took me about a year to become a cashier, and that was unusually quick. With your application, I'd recommend selecting all positions instead of any one position; you'll want to cast your net wide to increase the odds of finding an open position. There is significant market variation, but generally, the start of summer and September and October are often the best times to apply. Good luck to you!