What happens after applying I-130 petition?

After you file your Form I-130 petition,

USCIS will contact you in about two weeks. USCIS will mail you a notice of action letter confirming that you petition was accepted. In case you did not properly fill out Form I-130, or if you failed to provide supporting documentation, USCIS will ask you to provide more data.

 

Also read:
What is Date of Admission on Form I-90?