Since you put wolf in the menu, I'd suggest a .243, or up, for a rifle. There are a whole bunch of calls on the market that will call both. Distress sounds are what do well on all predators! If ya got the cash, then a electronic call would be an easy to get started, and the Fox Pro is hard to beat. Lots of different brands of camo. too, predator camo is a good choice and seems to work well in the open terrains that seem to be dominate in the winter time!
If you've never done it at all, and have no idea of the sounds that you're trying to imitate, a good calling dvd will give you some ideas, and there are a bunch of them on the market too. I'd suggest buying a couple of them, and watch, listen, and learn what the guys are doing. You don't have to mimic them to the T, but learn the gist of the sounds and rythems of the sounds, and you should be able to call some coyotes!