I don't know about your local market, but here's what I've found in my area (southern Oregon).
The silkies and d'uccles would probably sell okay as straight run, cause that's how they're sold at the feed store. But trying to sell straight run Red chicks would be tricky. Competing against the feed store when they're selling sexed pullets for under $3 a chick is hard, you're going to lose money IMO. Unless you're in a pretty rural population where roosters aren't so much an issue, folks want pullets and they're willing to pay a touch more for them.
I've found my best market is point of lay pullets. This is harder than chicks, cause you have to have space to grow them out. But I can get $20 for a young pullet, pure or mixed breed.
Or look into using your Red rooster over some silver hens to make sex linked chicks. That's another great market, cause folks do love baby chicks. You get the cute factor, and you can guarantee gender. You still need to have a plan for the males. Some just cull them and use them as compost, some market them to reptile owners, some do manage to sell them as males for meat, some grow them out and eat them themselves.
Fliers at the feed store and CL are the best advertising, IMO. A lot of folks use FaceBook, but I'm not so much a fan there. It could be a great marketing arena, though.