Most export transactions do not require specific U.S. licenses, but depending on what you plan to export, you should research the federal agencies that regulate those goods. General information is available in this Import/Export guide. You may want to consider applying for an Export Trade Certificate of Review. I also suggest that you contact someone at your local U.S. Export Assistance Center. The Export Assistance Centers help small businesses export overseas, so they may be able to provide some insight on commissioned intermediary licenses.