US Immigration from Brazil

Does the status of "Ready" mean I can schedule the appointm? Or does my fiance have to receive the packet from Rio de Janeiro first AND do I complete And upload the ds-160 and I-134 befir or after she recieves the mail from Rio? Sorry about all the questions, I want to stay focused and do things the right way so I only do them once. Thank you in advance.

the notice says that my Visa application is in transit to Rio, and that the NVC sent me an interview date. but I don't see any attachment. I don't know where it is or how to find it

my fiance already has both shots for the covid virus. I was wondering, for the K1 Visa if she could get the MMR, Tetnus, Hepatitis B Etc vaccines in Brazil prior to her interview. I was wondering if that's acceptable.. Or does it have to be in the united states. Than you

My (now) fianc was denied a visitor visa 4 years ago when I tried to petition one for her. The consulate said they didn't feel that sge had ties fir her to come back to Brazil. Now for the K1 Visa they are asking the question (see below). This is a different situation but i am wondering if the consulate will have issues with the truth. I want to mark the answers as yes but I am unsure of what to do. Any advice?

I received my case number over the phone today but wanted to know if I could register and submit a DS-160 or if I had to wait for the Welcome Letter to come in the mail.