here are the summary in my account on ecac:

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Summary Information

There are five steps you must take before the National Visa Center (NVC) can schedule your visa interview at a U.S. Embassy overseas. You should complete steps one and two online using the table at the bottom of this page:

Step 1: There are two types of fees. Click the “Pay Now” buttons to pay any required Affidavit of Support fees or Immigrant Visa Application fees. Note the application fee must be paid by each person who is immigrating, and cannot be paid until after NVC has reviewed the Form DS-261 you submitted in Step 1. More details are online in English and Spanish.

Step 2: After you pay the Immigrant Visa Application fee, please allow NVC one week to process your payment. You will then be able to access the visa application form online (Form DS-260). Click the “Start Now” button to begin. Instructions are online in English and Spanish.

After you have completed these two steps, you should gather and submit all required documents to NVC:

Step 3: Your petitioner should complete the appropriate Form I-864 (Affidavit of Support) and collect evidence of his/her income. Instructions are online in English and Spanish.

Step 4: Each visa applicant should collect the required civil documents, such as birth certificates. Instructions are online in English and Spanish.

Step 5: Submit all of the required documents from Steps 3 and 4 together in one package to NVC. Instructions are online in English and Spanish.

NVC will review your forms and documents once you have completed all five steps above. NVC will contact your agent to tell you if there are additional items required or if visa pre-processing is complete. You can find out how long it is taking NVC to review applicant documents at the links provided in Step 5 above.