Honestly, my recommendation for people just starting out, especially while they are still learning to control their cooker, is to just make the most simple pulled pork possible.
Just put some rub on the butt while you wait for the cooker to fire up, and when you have the cooker at the temp you want, just put it in there. Then learn your cooker. Keep the temps where you want it. Cook the butt until it is probe tender, or the bone can be pulled out with no resistance. Let it rest before pulling, then pull and enjoy.
The reason I say this because if anything goes wrong, it will not be hard to figure out. If you are not only learning your cooker, but also woried about injections, marinades, brines, slathers, mops, bastes, pans, foil, etc, you're just going to make it harder on yourself, and if something goes wrong you're most likely not going to be very sure what caused it.
Beleive it or not, a simply cooked butt, with just rub and properly applied smoke and heat, is damn good. It doesn't NEED all that other stuff. It's just plain good as it is.
After you nail this, and have your cooker figured out, start changing things one at a time. Add this or that. But just one thing at a time. This way you will know if it truly made things better or not.
Sometimes, I forget that you are a foil-hat-wearing, spotted owl killing, gun toting, science denying, right winger college dropout -- and I agree with you.
CD