Think thoroughly what are your reasons for breeding mice. Are you planning to take part in shows with your mice? Are you interested in breeding only pet mice (note: "only" in this conjunction means that you are not interested in breeding mice with standard quality appearance as well as perfect pet qualities!!!) to satisfy a need for pet mice in your are? Do you want to breed only one litter from your mouse female?
In all these cases you need to know those things mentioned above! If you're interested in breeding mice and showing them, you also need to learn about genetics and colour inheritance. In any case you need to understand the meaning of "inheritance" and how it works. Not only colors and markings are inherited - it applies also to health and temperament!
You have to know about proper breeding "techniques" and understand the meaning of words "inbreeding", "line breeding" or "outcross".
If you are interested in breeding mice so that others in you area are able to get them from you,
Breeding mice for fun may be fun for you, but for your mice it is always a stress. Females do not need to have at least one litter in their lifetime in order to be happy - in fact not breeding from your females can give them a longer life with a smaller risk of developing a mammary tumor. Furthermore, the babies you produce may not be at all happy to exist - especially if you have dumped them in a bad pet shop or have sold them to the first one that's interested without checking the new owners' knowledge and facilities! They did not ask to be born - it was your idea!