Relax. Don't worry. All this means is that everything is normal, even your request for a waiver of the filing fees has been approved! Just lay back and let them process your application. They'll contact you if they'll need anything else (they won't..) In a few weeks you'll be called in for your biometrics, a month or two after that you'll receive your employment authorization card and your advance parole travel document (if you filed for it and are eligible) and barely a month or two after that will be your I-485 Adjustment of Status interview, at the conclusion of which you'll be told that your green card status has been granted.
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Everything is normal. The initial review can take 6 to 10 months under normal circumstances. It can take longer if there are questions about your application. You have the receipt number and can check the status and processing times at uscis.gov.
It means that your application is being reviewed. If anything is missing, you will be informed. You can check your case status via the 800 number provided you or go online at USCIS.gov .
The herein content is for general informational purposes only, and may be predicated on incomplete facts. It should not be relied upon in making legal decisions or assessing your legal rights or risks. Neither does the herein reply create an attorney-client relationship.