1. I would keep the smoker between 225-250 but that is just my preference. Anything at or above 225 will be fine!
2. Make sure you take them to at least 165 IT
3. Not really a guide, just go by temp
Now then here are a few other tips. You could if you so desire brine the breat & that will keepsome mositure in them, OR you could even wrap them in something like bacon to also keep them moist. Sprinke some rub on the outside? Remember they will look pinkish inside, but as long as your IT is accurate you'll be fine.
Good luck! Let us know how they trun out & DONT FORGET THE QVIEW!!