Instead of a true dry run, do something simple like a fatty or two. Not a lot of meat mass to deal with and it will give you a chance to get the feel of the smoker and how to regulate the temps. Also not expensive and does not take more than a few hours. I would run it with the water pan the first time out and just put a foil pan on the lower rack to catch any drippings. You could also do chicken, etc...
Remember on a
WSM, top vent is always 100% open and you adjust temps by the bottom vents. Also using dampers (vents) to control any wood or charcoal pit is a slow process. It takes a few minutes for the result of your action to show up in the pit temp. So if you start running higher than you want and close the vents some, give it 5 minutes to settle back down and re-evaluate if further action is needed. Don't panic if it still creeps up some more after you close the vents some as it takes a few minutes to choke back the fire from the reduced air flow. Otherwise you will be chasing temps all over the place (and this is true of any pit, but the
WSM will be fairly stable by it's design). Same advise goes for if the pit is running to low and you want it to heat up a little more, it takes a few minutes for your action so show results.
A new and unseasoned
WSM will run a little hot from the bare unseasoned metal too (often does, but does not always).
You are going to love the
WSM and the learning curve is not hard at all. It is a well built smoker that will last you a long time.
Oh, one more thing. A seasoning run it the WSM does not require you to put anything on the inside of the smoker. You don't need to coat it in spray oil (PAM) or cricso like you would a steel smoker. The metal is sealed with a hard ceramic coating from the factory and there is no factory gunk to burn off either. It should be clean, dry, and shiny ceramic black coating. The seasoning you see people talk about on a WSM comes from the smoke after a few runs, not some spray on stuff.
You might also want to check out this link (and this site is dedicated to the WSM so look around while there).
http://www.virtualweberbullet.com/seasoning.html