Your best avenue is to retain an experienced immigration attorney who knows exactly what and how to proceed. Having an attorney does not expedite the process per se but an attorney will prepare and file the case more quickly and properly.
Assuming your i-130 was approved the case will be sent to the NVC for further action. You will receive instructions from the NVC.
Your wife must now apply for an immigrant visa through the National Visa Center. Submitting a complete application will expedite the process so that the help of an experienced immigration attorney would be beneficial. If all goes well your wife can be in the US within 2 months time.