For outdoor cooking you're looking for one with feet, not the kind that go in an oven. I have a 10" and 12" lodge. The smaller one does for my wife and I, the larger one for more folks. Recommend The Scout's Outdoor Cook Book for receipes, including many for the dutch oven. Also gives some basics on heating and temperatures, though that takes some experimentation.
Each tasty recipe is accompanied by easy-to-read information about cooking method, basic essentials, and instructions.
www.scoutshop.org
There are a lot of camp cooking ideas available in scout related cookbooks and a wealth of free online ideas at a number of websites. Sorting them out to find the one you're interested in can be tough as a lot of the the recipes are of the "dump and stir" variety and many won't fit your ingredient preferences or cooking methods. But some have better applicability for most of us than that. Like every other cookbook, you'll have to sort through them and be flexible in when you modify them.
A longtime favorite cookbook that has been around in several editions over many years is the "Camp Cookery for Small Groups" cookbook. It is aimed at the smallest basic unit of a scout troop which is a "Patrol" of around six youths. The cookbook gives clear instructions on how to develop a menu for a camping trip, how much food to buy for the trip with thoughts on frugal shopping, how to reduce packaging, to scale the recipes up or down based on group size or varied appetites etc. And ingredient prep tips, a list of the cookware, accessory items such as aluminum foil and the utensils needed are included for each recipe.
Of particular value, it discusses how to gauge temperature by how many charcoal briquets you need for the top and bottom to have the right level and location for the heat needed, what the food or the liquid in the pot should look like at various stages to determine if you are using the correct amount of heat etc.
Perfect for patrol-sized groups, this easy-to-follow cookbook offers simple recipes for complete and balanced meals that feed six to eight.
www.scoutshop.org
There's an old saying in the traditional barbecue world that also applies to Dutch oven cooking.... "If you're looking, you ain't cooking"
While DOs generally recover heat faster than BBQ smokers do the theory applies to many recipes. For instance, most baking heat needs to come from the top of the oven so removing the lid to check on some types of baked goods affects cooking time and browning much more than checking your oven fried chicken leg quarters does.
Once you learn temperature control with charcoal briquets it is pretty easy to transition to coals. Temperature control is at the heart of most Dutch oven cooking as you can't see the food in the oven and we need to balance the need for different amounts of heat above and below the oven in different recipes. So you generally have to rely on experience or darn good instructions. You don't want to spend a few hours making you main course or one pot meal only to find out that it is ruined or ready long after the rest of the meal has gotten cold. I'd suggest that when learning to use a camp oven that briquets are the most nearly foolproof way to learn temperature control.
And if you want to speed up the process of learning temperature control, especially when a group is learning together, consider getting some of the refrigerated tubes of biscuits to experiment with. If you turn a batch of biscuits into well browned biscuits with a raw center or burn them into hockey pucks you can still have a successful batch a few minutes later. Of note, a stick of good butter or a few jars of jam go a long way to making this more rewarding and fun, especially for youngsters. For now, concentrate on learning temperature control and all else will be much easier to master.
And as time permits I'll toss in some ideas of how to convert your favorite home recipes to great campfire meals. It's probably easier to do than you think.
Lance