Hello Hazelrigg! Welcome to HC! Im sure you will find all the help you need here. We have friendly and experienced members on the forum
Im glad to see you doing your research first, that always makes me happy to see people acting responsibly, its refreshing!
For first time hamster owners, especially children, the syrian hamster is always recommended for the reasons Suga already gave. They are easy to handle and tame, you can cuddle with them and they arnt to fast.
As far as sex goes in hamster it doesn’t really matter. I find both act the same, no sex is different then the other in my opinion.
Id definitely look into finding a hamster breeder if you plan on breeding the hamster. Most store hamsters are mass bread for money, so standard isn’t really a important thing in that case. Also they may be prone to more health problems. If your not looking to breed then I highly recommend checking out a local animal shelter and adopting a hamster. There may be rescue organizations in your area.