Hi Zedag,
Here you can find all steps to be followed:
https://travel.state.gov/content/travel/en/us-visas/immigrate/the-immigrant-visa-process/step-1-submit-a-petition/step-2-begin-nvc-processing.html
2 months you mean time for interview? What is your visa type? As far as I am aware they are catching up in Family Based, but 2 months I think it is way too quick as far as I am aware.