Hiya, and welcome to BYC!
How old are the silkie chicks? If they are chicks, they will not be able to be integrated until they are a few months old, closer to 4 or 5 months. There isn't anything like integrating chickens with ducks as they both do their own thing, but you cannot have a male duck around chickens as they will injure them by trying to have sex with them.
Your silkie rooster will most likely not hurt the younger silkies. If one of those younger silkies is a rooster, eventually they may fight but not all do...they may just get along.
If you post pictures of your silkies, get us a head shot showing their combs and another one from the side, showing their head and neck. We can try tell you their sexes if they're old enough. Usually they have to be at least 3 months old, preferably 4 to be able to discern sexes.