2: NO as my laywer suggested, also you will have an interview anyway (bring the new job order or employment letter with the job description, title, and salary) with all other supporting documents
3: Fill AR-11 and mail it. Also call INS (Local office) to update your 485 address. (they are separate processes)
4: Not clearly on this one. Mostly still in VSC local office. Better to keep your case there. (The worst case is they lose your documents in transfer.)
I hope those info help you. Good luck.