1. First, you need to prepare a detailed email to submit your application to the American consulate or embassy. In the email, you need to provide personal information, such as full name, date of birth, nationality, contact information, etc.

2. Describe your professional background and work experience, including your current work situation and position, explain why you want to work in the United States, and provide supporting documents related to the position you are applying for, such as academic certificates and letters of recommendation.

3. State in your email your understanding of the American work visa and whether you have studied the laws and requirements related to the visa. Visa is a kind of license issued by a government agency according to its own laws for foreigners applying for entry, exit or transit. The visa is usually attached to the passport or other international travel documents held by the applicant.