I just did my first brisket on my 22.5 WSM, it took 14 hrs. and then had 2 hrs. rest time in the cooler. I ran my chamber temp at 200-225°, started with a full ring of briquets with some hickory chunks. After 14 hrs. I still had about 1/4-1/3 of my briquets left!
I would put the brisket on the lower rack, cook it till it just gets past it's stall, wrap it in foil and take it to 190°, then pull it off the smoker. Wrap the foiled brisket in a towel and put into a cooler, fill rest of cooler with towels. Your brisket will rest, and it can stay hot in the cooler for several hours.
Now for the ribs. I would put the ribs on when you foil your brisket. They should finish up about 1 to 2 hrs. after the brisket was put in the cooler.
Plan on having everything done 3 to 4 hrs. prior to eating time, just to be safe. I usually prefer not to foil my ribs till I pull them off of the smoker. Then I foil them and rest them in a cooler for an hour or so. That way I get some nice bark, but then soften the bark just a tad during the rest time.