I did my ribs on the 22.5 kettle for years before I got a smoker.
Bank your unlit coals and a few wood chunks on one side of the coal grate, and a drip pan on the other. You will put your meat over the drip pan, and your lid vent above the meat.
Use the Minion method, placing 8 to 12 lit coals on top of the unlit coals and wood chunks -- the amount of lit coals varies with weather conditions.
When you get up to temperature, you will close the top and bottom vents down almost all the way -- again, weather conditions will effect how much you close the bottom vents. I leave my top vent open about 1/8 inch.
Use the bottom vents to adjust for swings in temperature, which will happen smoking on a kettle. I aimed for 250, but during the day, the temperatures swung from 220 to 300 on average. That's not a big deal on ribs cooked over several hours.
You will have to keep and eye on your temperatures, and make adjustments throughout the cook, but you can get some good results.
CD