The Department of State issues visas through U.S. consulates and embassies, which all offer student-specific information on their websites. Department of State can help you through many steps of the process of studying in the United States, including finding the right school or program, applying for a student visa, or becoming an exchange visitor.
EducationUSA can help you with information on the process of selecting a school and a course of study in the United States. With over 400 advising centers in 170 countries, EducationUSA represents the largest group of advisers committed to promoting accredited United States higher education institutions to over 14 million students and parents with whom they have contact each year.
At Travel.state.gov you can find information about applying for a visa.