한국에서 비자 발급 절차, KVAC 어떻게 진행하나요?

Hello! It's been over 10 years since I came to Korea. I'm back in Korea again this time, but I'm a bit confused due to the changed visa issuance process. I'm planning to work in Itaewon, Seoul, and I'm currently waiting for my visa issuance number from the school. These days, KVAC is in charge of visas, so I'm curious about what to do once I receive this number. Do you only need a passport, a photo, and a few forms for KVAC? In the past, I sent documents like degree certificates and criminal record checks to the school, but I'm not sure how things have changed now. Has anyone recently experienced this? I also want to know how long the processing time is. I would really appreciate any help!