Sounds like you got the right dutch oven for campground cooking, now just get you one of these
http://www.amazon.com/Little-Giant13-Quart-Galvanized-GP13/dp/B000FJX8C8. They help contain the charcoal, provide some wind break (for the bottom coals) and make cleanup easy (Just let it cool and dump ashed into fire pit or trash).
Just watch what you put it on as it can scorch the ground. They are light weight and you don't need to carry around a heavy dutch oven table. I have used them everywhere. You can put it in the fire pit area if the campground provides one, or on the gravel, or dirt and they work great. I also carry a wire grate that I lay over the feed pan to grill steaks, cook foil dinners etc. It gets the coals a lot closer to the food that many of the campground setups. We even roast marshmallows of the remaining coals after dinner. Cooking with Charcoal is easy. Stick with items what cook under a hour and you do not have to keep refueling the charcoal, or stay stuck watching the fire too long. Desserts are real easy. With the fire restrictions that occur in Colorado I always make sure whatever I am planning to cook that I can also cook it over the propane stove in large pot.
The others type Dutch oven's you listed are good for the house oven. And as Bill said the enamel colored one are mostly for looks and easy clean up without having to season it. Although I think the seasoning of cast iron is what makes the food taste better, especially while camping.
Try this link
http://tnttt.com/images/2012/TnTTTCookbook1.pdf for recipes. Search in this forum and and you will find there is also a second edition.
Try this link
http://www.tnttt.com/viewtopic.php?f=44&t=57160 for CRA Dutch oven training seminar by Bob Henry
After that you should be well on your way
Dan