After the wedding, how long do I have to wait to sponsor him to come to the US?

Best wishes upon your upcoming marriage. Generally, following marriage to a U.S. citizen there is no waiting period whatsoever before the U.S. citizen spouse may sponsor her husband for immigration benefits. In your circumstances, I presume that after you become married abroad you plan for your husband to "consular process" for the process by which he will seek to become a Lawful Permanent Resident (to get a "Green Card"). Of course, there are many details that address eligibility. It would be wise for you and your fiance to consult with an immigration attorney who, after learning all of the relevant information, could advise about eligibilities, options and strategies to attain your immigration-related goals, and who then could offer legal representation in the often complex application process.