Hmmn..how to cook millet and quinoa?

Hi! Im trying to add new grains to my diet, following the advice of a nutrionist!

She recommended I use quinoa, millet, buckwheat, and short grain brown rice.

Do ALL of these need soaking over night?

How much water should I use when soaking in ratio to the grain?

Can I mix the grains, have a little of each at a meal? Is it ok to eat them every day? I hope you dont mind me asking you all, but I think my nutritionist is getting annoyed with me asking her questions all the time!!

:)

Thanks everyone :)