Mmmmm, love my Dutch Ovens. There are a ton of resources on the web and Pinterest if you're willing to search, also some great videos on Youtube.
What brand\size did you get? No matter what brand, my #1 advice is to season it properly before you ever use it. Even if it says "pre-seasoned" I'd do it. There are a variety of ways, but most common is to coat the thing in Crisco and put it upside down in a grill or oven at 250* F for an hour. Let it cool, then do it again.
Then after you've done that a few times and are happy with it, BACON! Throw a pound of bacon in there over some hot coals and fry that up. Not only have you added some extra seasoning to your DO, you've now got a pound of awesome bacon to eat.
Second thing to make is a cobbler...best ever (and easiest) camping dessert in my opinion. Flour, sugar, grease! Dump in a can or two of pie filling (amount depends on the size of your DO). Cover that with a box of cake mix, I use the cheap Jiffy yellow cake mix. Slice a stick of butter into small pieces and lay those around the top of the cake mix. Put your lid on and set over your ready coals. Basic rule of thumb is a ring of coals underneath, 2 briquettes less than the size of your DO. So 8 coals under a 10". Then 2 more than the size on top, so 12 coals on the same 10". It'll take about an hour, and I recommend spinning the lid every 15 minutes to ensure an even bake. Lift the lid, check it out, see how it cooks, learn how your DO works.
A nicely seasoned Dutch Oven doesn't need a liner and will clean out nice and easy with hot water. Never, ever use soap! I fill mine with hot water and put it over hot coals or a camp fire, boil it, scrub it with a brush I use only for this, and it cleans right up. Never put ice cold water in a hot Dutch Oven, you can crack it.
After you've burnt something on there once, or you just feel like being lazy, parchment paper will be your best friend! You can buy premade ones, or you can follow this guy's advice on how to make your own which is what I do.
Make your own parchment dutch oven liner | Backyard Life BlogBackyard Life Blog
I'd highly recommend a charcoal chimney for starting your briquettes. This has worked really well for me to get the coals going quickly and evenly. You can buy one almost anywhere for $10-$20 depending on how fancy of one you get.
I recommend the lid lifter (mine's a Lodge deluxe lid lifter, around $20), however I used a pair of pliers for the past 10+ years just as well.
I use the Dutch Ovens around the house too, not just camping. I don't have a DO cook table, as much as I'd love one, so I purchased inexpensive galvanized livestock feed trays at our local Tractor Supply store for around $5 each. I have one to start my charcoal in and one for each DO. These work fantastic! Pics below.
Websites I like for DO recipes. Some great recipes here that shows it's really just another way of thinking - you can cook ANYTHING in a DO that you could cook in your home or RV oven.
Everyday Dutch Oven
The Boy Scouts know what they are doing...
For YouTube I like these channels:
Outdoor Cast Iron Cook
Here are some photos from both campouts and in my driveway. My only real advice is to just use it! Learn how it works, how to adjust the coals, and have fun. Only thing I haven't tried yet is bread, I plan to try that this year.