If you accept UCLA's offer of admission, the UCLA Dashew Center for International Students and Scholars will email you instructions for applying for an I-20 form online. Along with your I-20 application, you will be required to submit electronic copies of your passport, as well as financial documentation which demonstrates that you possess the necessary funds to pay for the costs of tuition and living expenses. After receiving and processing these items, the Dashew Center will issue your I-20 form, and the law school will ship it to you.
After receiving the I-20 form, you must make an appointment at the U.S. Embassy or Consulate in your country of residence in order to apply for an F-1 student visa to travel to the United States. Please make an appointment well in advance of the date you intend to travel to the United States, as some embassies and consulates take several weeks (or even months) to process visa requests.