Brining:
One cup of table salt per gallon of water, you can put spices in at that time, I grind the spices with a coffee grinder. Enough brine/spice mix to cover meat. Put in fridge overnite. Brining makes all of the cells fill up with water, that way they will not be dry. I do my Thanksgiving turkey this way too.
Cooking:
Slow cooking is the key. You can wrap the ribs in cling wrap the aluminum foil and cook for about eight hours sealed up this way in the oven at 225 degrees. This way they cook in their own juices just above the boiling point of water. You can smoke slowly for a day. I do mean slowly. If you cook in the oven, when they are done, you can put them on the grill to caramelize (burn) the outside of them on a very hot grill.
I don't sauce them until I caramelize them.
Now comming up with a good sauce is another matter, I've been searching for years for one that works right for me and have failed.