Go outside and listen to them howl at night. Unless you live in a major city, you will hear them. Just sit on your deck and listen.
Once you can distinguish the males from females and pups, you'll know what to try and produce.
Howling.... you gotta talk to them.
The only way to learn howling to coyotes is to be out there and get experience.
EDIT: I've been known to get a few beers in me and howl with my voice at them late at night lol. I swear it works though. I don't kill them around the house though. Practice yotes. When they kill a rabbit up behind the house, you couldn't tell the difference between the real thing and the Circe.