Before you can begin the process of acquiring a visa, you will need a Certificate of Eligibility (COE). You can join a university as a student in F-1 status using an I-20 or in J-1 status using a DS-2019. You will also need a COE for other important steps in the arrival process.
The ISSS team does note create initial immigration documents. If you have not received your COE yet, review the COE Information page to learn more about the process.