Jay,
Welcome to SCH.......Well, you've picked one of the easiest forms of hunting here in SoCal.....Not necessarily the easiest to get a coyote, but the easiest to get into.
Hand calls are very reasonably priced and pretty easy to use. And many a dog have been lured in with them.....The fancier you get with electric calls, the more it will cost you.....Up to you what you want to spend.
The other easy part is there's coyote almost everywhere and they're on almost all public lands we have here in SoCal.....Imperial Valley isn't that far from SD and it's loaded.....Although, you can get them during the day, night time hunting is allowed as well.....Good lighting is good to have.
One more thing that makes them easy to hunt is, almost any rifle will do.....The farther you want to shoot, the more you can spend on a firearm.....Again, that's up to you.
Good luck