I suggest you get Randy Andersons Calling All Coyotes DVD or VHS. It will teach you all the different calls, etc for calling coyotes. It isn't filmed where you are at (mainly in Nebraska and South Dakota), but its a good start.

I use a 243 for all my coyote calling, I used to use a 223, but I like the way my 243 bucks the wind better, and if a deer presents itself during season I can smoke that as well.

I have no idea what caliber to reccomend for wolfs. I'd think a 243 would be minimum.