Thank you, this information is much appreciated!Read the thread Raising Guinea Fowl 101 and pay particular attention to posts made by @PeepsCA .
Guineas are a flock bird and do best in large groups. I never recommend getting fewer than 10 guineas. They need a high Protein turkey or game bird starter for proper development.
Guineas can be sexed as adults. The hens will be able to do a two syllable "buckwheat" call. The males will not makes this call. The females can make all the calls that the males can make. When a guinea hen lays an egg, it is proof positive that she is a hen. Guineas do best in a ratio of 1 male to 1 female. Some males may prefer to have more than one mate.
I do not recommend brooding guinea keets with chicks due to the problems that imprinting can cause when they are mature. I don't recommend housing them with other fowl either.