We have a Pekin and a Rouen, 4 red sex link girls and a black sex link male. Ours are together for the time being, sharing a run and with only minimal separation in the coop. (That'll be changing in the next month or so.) We were totally new to this and per the feed store owner's instructions, we have fed them non-medicated poultry starter from the beginning. We are just getting ready to start adding scratch to it and then in a few months, we will replace the starter with laying pellets. For treats we've given the chickens yogurt and the last time they had it, Lucy the Rouen ate most of it!
The ducks love any kind of green but the chicks tend ignore them. Oatmeal is a big hit with the chickens. We have been very lucky for our first time and all of our birds are big and so far healthy *I'm knocking on wood*, and if you ask me, they're pretty darn happy, too.
Everyone is a little different, but these things have worked well for us. Good luck


