I decide what breed I want, then do some research to find breeders (e.g. via the breed society), then arrange with them to get a couple of fully feathered chicks or a carton of hatching eggs when they are available. I started down the hatching egg route just to satisfy the desires of one of my hens, who'd gone broody, but that is definitely my favorite route now. It avoids the risk of bringing in some dreaded lurgy, and they're integrated from day 1. Watching a broody and chicks is also my favorite pastime of all