You can expect an Interview in 3 to 4 months. What consulate you belongs to?
Here is the process:
Lawyer sends the package 3 to NVC. NVC will do review of your case. It may take upto 8 weeks. But genrally it takes 10 days to 2 weeks if every thing is fine. AFter NVC completes review, it prepares the documents to send to consulate. Within a week after completing case, it sends them to consulate. You can track the statuses by calling NVC AVM (1 603 334 0700).
Once consulate receives the case, it takes approximately 2 and half to 3 months for interview. One month before interview, consulate sends you the packet 4.
For a check list of documents, search in this forum. You will get a number of messages that provide you complete list.