You're almost done now!
1. You'll want to bring it to the attention to the biometrics person, and he/she will change it in their system for you. This seems horribly common, and that's exactly what happened to me, too. Haha.
2. I just made a written note that it was my former married name, then listed the actual name I intended to apply with.
3. Priority service is purchased through WorldBridge. You'll need your VAF# on hand for this. Go to their Additional Services page for more info; they'll tell you what you need to do.

Make sure you get Settlement Priority rather than regular priority, and write it on the outside of your shipping package along with the number as instructed.
https://www.visainfoservices.com/Pages/dest_org.aspxI believe what I last read here was that you need to do your online application, then your biometrics, and THEN get the priority service on the day you intend to mail your stuff out.
ETA: The WorldBridge site can be OBSCENELY slow at times, so just give it time if it's acting up. After I unblocked it from my bank and went to try again, the purchase page was sooooo slow. I'd heard about some people getting double-charged, so I just let it take its own sweet time loading the page after entering my payment info. It worked fine for me. I guess I just made the mistake of purchasing while they were doing server maintenance or something, ugh!