US Visa for Paid RI

As Title says, I am planning to apply for summer 2026 US Programs, for doing paid internship in USA On-site you would require a J1 Visa. Wondering if any of you can share their experience with this. I am aware of the basic forms required DS-2019, DS-160 and paying for SEVIS-I-901. But I wanted to what other documents are required at the time of appointment as a non earning student.