Hi sounds as if you have purchased some sprouting seeds.You are correct they are very nutrional to our greys.i will do a step by step guide on how i sprout mine.
Rinse some seeds in cold water.
Soak overnight in cold water.
in the morning rinse them agin in a colinder with running water.
Spread them out on a damp paper towel
leave them somewhere warm,check on them & if they feel a little dry rinse them again.
within the next 24 hours they should start to sprout,You can leave them a little longer if not many have sprouted.
Feed some to your grey,the leftover ones can be kept in the refrigerator as they keep for a few days & continue to sprout.
You will get the hang of it if it doesnt work the first time, have another go
hope this helps.