Well, I have finally ventured into milk kefir. I started out trying to use the starter cultures that you can find in the store. But, that got expensive since they don't really multiply well. I purchased real milk kefir grains about two weeks ago. They arrived last week. I covered them in raw whole milk and set them on my counter. Today, I finally had the time to do something with them. I may have left them a little longer than necessary, but they seem happy. They've multiplied already! As I said, I may have left them a bit too long - the kefir is slightly cheesy-flavored, but otherwise good.
I started off with a bit over 1 tablespoon of grains. I split them among 4 jars. Covered each with 1 cup of raw whole milk. Set on the counter for 5 days at room temperature.