You will need to file an I-130 petition for alien relative for your husband. It will first get approved by the USCIS and then the file will be forwarded to the National Visa Center and then the U.S. consulate. He will then have an interview and obtain an immigrant visa stamp in his passport. Afterwards, he enters the U.S. and is approved for permanent residency at the port of arrival. This should take about 6months or so. After you file the I-130 you also have the option of having him come to the U.S. on K-3 visa. You should consult with a lawyer to discuss timeframes for the I-130 option and alternatively the K-3 option.