For your first time I would keep it simple and just cook them
try to get the WSM running somewhere between 250 - 275 and don't bother with foiling or spritzing, etc. Just rub then and put them in and don't look for about 4 hours (depending on how big the racks are and whether they are full spares or St. Louis trimmed).
Either use the bend test or the toothpick test to tell when they are done.
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