Start with the poultry, which generally take the longest to cook, over a moderate hot flame. Grill until the pieces are golden brown on both sides and cooked through. Total grilling time should be about 30-40 minutes for the ribs, 15-20 minutes for the chicken or cornish hens, 5-10 minutes for quail.
A few minutes after your start your poultry, add the pork chops, veal chops, and/or sausages, grilling them, too, over moderate heat until golden brown on both sides and cooked through. Total grilling time should be about 10-15 minutes. (NB: If using very thick chops, you may want to put them on at the same time as the poultry.)
The pork belly should also cook over moderate heat to allow some time for the fat to render, about 5-10 minutes total. You want the strips to brown on both sides but you don't want them as crisps as you might make bacon. Pork belly is at its best when crisp on the outside but still chewy on the inside.
For me, the only way to eat a steak is nicely seared on the outside and rare on the inside, flash grilled over the highest heat you can manage, about 3-5 minutes per side for your average steak. Grill the lamb chops just the same way. The steaks and chops should then rest on a baking rack for five minutes or so while you finish grilling the other meats.
For the kebobs, follow the directions found in this post.
If any of the meats (other than the steak or lamb chops) are done before the others are ready to serve, you can move them to a cooler side of the grill, on a warming rack above the grill if you have one, or simply set it aside and then, just before serving, return it to the grill just long enough to heat it up.