Basically you want tocrush them enough to break the husks open and crack the insides. as far as storage of un crushed grains, you can store them in the bags/containers they come in. As long as they aren't crushed they should keep for about a year.
"Yes, I am a pirate two hundred years too late. The cannons don't thunder there's nothin' to plunder,
I'm an [under] forty victim of fate, Arriving too late, arriving too late."