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In Missouri, if you drive a shuttle bus or other vehicle for work and it carries 14 or fewer passengers, you must obtain a Class E or for-hire license. The Class E license enables the driver to operate any bus that weighs 26,000 pounds or less in gross vehicle weight as long as no hazardous materials placard is required.
At the time you apply for Class E license, you must be at least 18 years old and must meet the under-21 requirement for obtaining a full license. Obtain the Class E by passing a road sign test, a vision screening and a written exam. The driving test is only required of applicants who do not already have a valid Missouri driver's license.
DMV.org: Special Licenses in Missouri