looking at brewing an oatmeal stout. This will be my first stout and 4th overall batch. I will be kegging this also. My question is with this particular type of beer how long should I leave in the primary and should I use a secondary if so how long in 1 or the other or both? Also is there any other special thing I should be aware of with this type? One last thing after kegged how long should I wait to drink?