Need to know more. Assuming you are over 21 you are either under the Family Based 1st Preference (if unmarred) or 3rd if married and there is a "quota" that control when you will be eligible to obtain an "immigrant visa" (green card). However if you lived illegally in the U.S. for over 180 days you will need to get a waiver (and that was the only time you were in the U.S. illegally). This is a complex case and you should see a qualified immigration lawyer (you can do it by telephone).
Cannot be determined on the facts posted, but given the time elapsed, it is likely that the process will need to be started with a new petition.
You should retain an experienced immigration lawyer to review all the facts, advise you, and handle the case. You can find one through http://www.ailalawyer.com.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.