Scent is VERY important! It's rare that a yote won't circle & come in downwind of the noise source. I always use a cover scent (bobcat urine works well . . . must be that "dog vs cat" thing). Arfin was dead-on about not calling too loudly, especially at first. I always use a coaxer/squeeker first-off, on the off chance I set up right on top of one (squeekers from chew toys work well; our Jack Russell provides me with one of these periodically). After you've called with your dying rabbit or crippled bird call without a show for 20 minutes or so, then you can kick-up the volume with a long range call. Pair the call with the available game . . . coyotes are far from stupid and aren't likely to come in to a dying jack rabbit call if jacks aren't native to the area. During January/February, howling works very well. Get a cd/tape and learn the different howls. Set up a scenario: female invitation howl, young male howl, female whimper (made when they're doing the wild thing), old male challenge, young male challenge, then yips as if someone just got their butt whipped. Bagged a lot of coyotes who came running to either see the fight or clean-up on what was left. Decoys help also; they will focus the yote's attention away from you. I quit hunting them with a gun in late February/early March and then use a camera. By then the females have been bred & I'd rather not eliminate next year's quarry on a wholesale basis. In the interim, I hunt them with a camera or just observe & learn until turkey season or the rodents come out. Enjoy; it's addictive . . . in my case, a passion. No money in the pelts anymore, but exceptional ones I take and tan or have them tanned if I'm strapped for time to do it myself. They make ggod gifts to hunting kin/buddies. There's tons of good info out on the web. Good luck! Also, when you bag one, don't jump right up to go get it. Stay put . . . another may show up.
