I'm pretty new to smoking, too. The first thing I ever smoked were Boston Butts. They were easy, and incredibly delicious.
If you're asking about wrapping it in foil because of the first comment on this thread (from c farmer), I'm fairly sure they meant cover the WATER PAN in foil, not the butt.
I just smoked a butt a few days ago (second butt I've smoked), and here are a few tips. Mine was 7.5 lbs, and it took 13 and a half hours to reach an IT of 200°F. I smoked it at 225° (I have the same smoker you do). Unless you want to start it at 4:00am, or eat very, very late, I wouldn't plan on having it for dinner.
I didn't use water in the smoker pan. Covering the drip pan, water pan and even the top of the chip burner with foil will make for slightly easier cleanup later.
I rubbed the butt the night before, covered it with plastic wrap, and put it in the fridge overnight.
I pre-heated the smoker at 7:00am, and took the butt out of the fridge for an hour so it wouldn't be super cold when I put it in the smoker. I put hickory chips in the smoker at 7:30am, and put the butt in (with the rack in middle position) at 8:00am.
I added more hickory chips at 10:45am, and then no more for the rest of the day.
The butt reached 200° IT at 9:30pm, and I took it out of the smoker, wrapped it in foil, and put it in a closed box to 'rest' for an hour. After that, it went in the fridge (still foil wrapped), because I was falling asleep. I pulled it the next day, and it was tender and perfect!
Good luck with your first smoke! It's addictive. :)