hope I am not too late on this but for your questions:
1. can't remember the answer for "trade or business name" but I think I put NA. you can call the number on the bottom of the back page and they are very helpful.
2. position is "collector"
3. the atlanta address worked for me and turnaround was less than 4 weeks. if that has changed since I would call to make sure. but unless you are told specifically by the atlanta office I see no reason to send to another location.