do i need to apply for citizenship or just greencard ?

No one needs to apply for US citizenship if he or she does not wish to do so. If your question is whether you can apply for US citizenship instead of only the green card, the law requires that you demonstrate good moral character during the five-year period prior to the application (three years if based upon marriage to a US citizen and applying on the basis of three years). If the courts dismissed the three charges against you without having you acknowledge guilt, then you may very well be able to meet the good moral character requirement provided there is nothing else in your background of a negative nature.Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.