Good info so far. I might add - notice the dutch oven inside a barrel or container: that lets you get a closer match to the temp chart. Wind chill can reduce a d.o.'s temp in spite of the correct number of coals. Placing in a barrel or having a piece of flashing to block wind is a good idea on windy and/or cold days.
The
Southeast Campers of VA/NC hold dutch oven gatherings where the experienced cast iron chefs are more than willing to share their knowledge as well. Their NC/VA 2nd Dutch Oven Gathering is March 27, 2015. More info here
https://www.facebook.com/2statedog?fref=nfStart with inexpensive dishes to get a feel for how your pot performs. A few dishes and you'll be cooking like a pro.