Sounds like a sound plan. I don't think it's necessary to cut whole spares down to St. Louis unless you want to for a specific reason. I like leaving them whole. I'm a big fan of the no-peek method for ribs. Good idea to go with the absolute easiest, and least fussy method for you first smoke as your benchmark. You can always fuss more with wrapping etc. later, and see if you like it better. I personally don't think wrapping part-way through is worth the trouble, and makes that big of difference, but some on this forum do. These smokers keep a really moist environment. Why open the door? I also don't sauce and put back in the smoker (although I think most people here do). I like to keep the ribs just with the dry rub, then serve sauce on the side.