Would a male or female mouse be best for a first mouse?

Hi my name is Melina and i am 9 years old.

I think it would be best to start out with a female because if you have a female hamster of gerbil or something of the rodent family if you have a male and you put it in with your hamster or gerbil female the results may end in you hamster and/or gerbil may become pregnant.