Hey G, I started out trying to cook with the same methods we use in stick burners and "traditional" smokers, and found that they are just not necessary! These cookers are very well-insulated and self-contained; they hold moisture in their enclosed environment! I don't foil anything anymore, and the results are stellar (and easy!).
Give your cold ribs a slather of yellow mustard, apply your rub, wrap them and put them in the fridge overnight to "get happy." Don't add any additional rub when you take them out, just put about 2 - 2 1/2 oz of wood in the smoke box, put the cold ribs in the cold smoker and set the temp to 225. I use a disposable aluminum "mini loaf pan" with apple juice or beer in it next to the smoke box (a soup can works, too). It's that easy. Give them a peek around 5 hours. You can use a toothpick to see if the meat is tender and pulls away from the bone.
Follow this method, and you'll have beautiful, tender ribs - it's like pushing the "easy" button!
The beauty of the Smokin-It units is simple, delicious BBQ! Don't get stressed, and don't over-think your first smoke - just have some fun!
Let us know how it goes!