I think a lot of people are probably thinking exactly how to answer Ilove, you are asking a lot of in-depth questions there!
There is an excellent internet site talking about genetics at the river road
http://www.hometown.aol.com/theriverrd/genetics.htm
but it is not as simple as just reading the article to be honest - you also need to know all the different colours/patterns of hamsters to understand how the genetics relate.
Different breeders do different things with regard to moving pregnant Mums - it depends on the cage she is in before getting pregnant - is it still suitable for raising a litter etc.
There are lots of different hamsters I would not breed from, not just colourwise, I would take into account size, age, health, known history and temparement. All of these are important along with colour! It can make it very tricky.
Before even thinking about breeding therefore, its usually a good idea to investigate all the possibilities fully. This can involve talking to breeders, reading books and internet resources of course.
there are some useful articles on this forum, and also some stickies on breeding that may answer some of your questions.
You have some very good breeders in Lancashire -
http://www.carringtonhamstercrew.co.uk are very helpful and Manchester based, and is a member of the forum, as is Nooboo who is also based around this area. Others include Yaffle too, and probably many more. I hope that helps.