The next big step is preparing for your visa interview. If you have not already made an appointment, you need to make one soon. Be prepared for a long wait during busy travel months. You can also check estimated wait times for a visa interview appointment in different cities here: http://travel.state.gov/visa/temp/wait/wait_4638.html
Visit your country embassy’s website for specific information and required materials to apply for your nonimmigrant student visa and set your visa interview appointment. A list of embassies, consulates and diplomatic missions can be found at http://www.usembassy.gov/ .
The following is a list of common requirements as a guide - this is NOT an official list. Always follow the requirements listed on your country’s embassy’s website for up-to-date and accurate information.
The consular officer may request additional information if needed, such as proof of ties to country, résumé, or official transcripts.
Please note that your visa cannot be issued more than 120 days before the program start date listed on your I-20. In addition, you may not enter the USA more than 30 days before this program state date, so make your travels plans accordingly.