AOS fee paid, what is next?

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My uncle is a USC, filed a F-4 case for my father and his 4 dependents with PD: October , 2002. Our PD will be soon current. I filled the DS-261 almost a month ago, still it shows incomplete status despite i filled everything, my uncle paid the AOS fee. Now:

1- whats next, petitioner should submit affidavit of support + supporting documents to NVC and a copy for us?

or

2- We should wait until DS-261 appear completed?

3- when the IV application (DS-260) will be available to fill?

4- who will send civil documents to NVC ? petitioner or applicant?

Thank You.

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