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Your guineas should calm down soon, they are still young and getting used to life. They free range right?
As for keeping guineas and chickens together, I'd say it's okay. I know some people have had problems with the guineas picking on their chickens, but I personally have never had any serious aggression from the guineas toward the chickens in my flock. They will chase them occasionally but mine haven't done any more damage then a pulled feather here and there.
You will need to raise the chicks to their full size (or 6 months at least probably) before putting them with the guineas. If you can, let the two flocks see each other before putting them together. Pen them next to each other for a week or so before mingling them.
Good luck!