US Immigration from Panama

Hello, (PANAMA CITY CONSULATE)

My fiancee and I have been approved by the USCIS 2.5 months after filing (I, the petitioner, received an approval notice via mail), and approved by the NVC 1.5 months after that (I received this approval via email, but it was addressed to my fiancee, the beneficiary). The email says the app is being sent to the Embassy in her country. I am a bit confused on what happens next.

1. Will I receive some sort of notification when the US Embassy in my fiancee's country has processed the application?
2. In the meantime, what should we be doing? Should we already be preparing the additional paperwork (DS-160, police certificates, her medical exam, evidence of financial support I-134, evidence of relationship)?
3. What is a police certificate?
4. Can she just use the same evidence of relationship we used in our i-129-f petition?
5. Does she just bring this paperwork to the Embassy with her when she is prompted to schedule the appointment?
6. How will the Embassy contact my fiancee to schedule the appointment? They have a postal address and her home phone number, not her email. I don't trust these measures of communication.
7. What if we cannot get all of this paperwork in order before the interview is scheduled. I've read it is sometimes difficult to get a medical exam scheduled.
8. How do we pay the filing fee for the DS-160? Is it brought we her to the Embassy?

I am very sorry for the questions. The process is stressful as you all know and I am not fully understanding the descriptions on the government website.