I've just created an account to know about my I-130 status. My receipt number is [b]EAC0813511712[/b]. When I track at uscis.gov, it just gives me that they had approved my form. But how do I know in which condition it is and what the next steps for me?

Best to call up USCIS and check what the next steps are. Ideally you should be receiving notifications through postal letters etc. But in the meantime you can call up and check what steps are required by you.