Welcome
to second grade...it's awesome. You are going to love it. Students are capable of reading alone and working independently, but still want to please their teacher and follow rules. I agree with the other post, both to MODEL everything as well as to spend a lot of time at the beginning with the rules. If you want to have a cooperative, smooth running room, these are a must.
I have a free choice chart for when they are finished working on their assignment. Things like read around the room, play a math game, book of choice, file folder game, puzzle, listen to a story, write a story, illustrate a story etc. However, if students rush and turn in crap for work...I make them show me their paper, and if it's not quality work, they can only read at their desk.
I like to order supplies from catalogs...or go to my teachers store nearby. One catalog i like a lot is Really Good Stuff. I spend the summer building my science units, social studies and math games, make new file folder games, organizing stuff...never a dull moment.