You recieve minimum wage. It's $7.25 an hour. Bonuses? You get to have a free 6" sub for lunch..and you can eat a cookie or two. The best thing about Subway, in my opinion is that you get to eat for free, and the work is not too difficult (once you get in the swing of things). How happy you are at the job depends mostly on two things. One: Friendly and competent co-workers. Two: you're okay with earning minimum wage.
If you're looking to move in to management, you'll have to dedicate at least 4 years or so to the job (and of course you have to be good at it). I'm pretty sure the manager earns more, but I don't know the figure.
It's a good enviroment and a good start up job for just out of highschool kids (like me). Now, about the customers.....