There are probably a multitude of slow cooker recipes all over the Internet. But really, a slow cooker (or crock pot) is fairly simple to use. One of the easiest things to do is simply toss in a hunk of meat. Whatever you desire. A beef pot roast, or a whole chicken, for example. For chicken you just season it like you normally would and toss it in. Put it on low if you want it to cook for about 6 hours or more (say, if you turned it on before you left for work to have a cooked meal when you get home), or set it to high if you want it faster, say 3 or 4 hours. For the beef pot roast I usually like to add just a little bit of liquid. Not much. A few tablespoons. My favorite thing is to add wine.
That's the basic stuff. Fantastic kitchen appliance to be sure.