Overfeeding ?

[Baby Ball(s)]

Hello, I just recently aquired a Ball Python. It's about a 14 inches or so, and I was wondering about its feeding habits.

The store that I got it from said they fed it mice, but I have no idea what size mice they fed it. To be on the safe side, I just picked up a bunch of baby pink frozen mice from Petco to feed it with. Every night, for the past 4 nights that I have had the Ball, I have taken it and fed it 1 baby pink mouse after dethawing it.

Is this normal? Should the snake eat 1 baby mouse a day, or is that too much? Also, are there any problems associated with just feeding the Ball baby mice or even just mice in general? Obviously people develop problems if they only eat one type of food for an extended duration, wouldn't that carry over for the snake? What else could I possibly feed it to vary its diet?

Sorry if these questions seem stupid, this is just my first snake so I'm a little green. :|