Hello! I am an International student too AND this was my first interview as well AND I just got an acceptance. SO PLEASE BE HOPEFUL! Even before I did the interview, I heard from many current students who said this was a very relaxing fun/interview, they really try to help you succeed and relax in the interview. So I would say just be your best self, don't let your nerves get to you, and practice common interview questions.
You will be fine just dressing as you would in an in person interview, yes there is time for lunch (you should be able to see this from the agenda they will send you). If you have not yet, i would also recommend going on
F-1 DOCTORS to speak to the current SKMC students there who are also intl students.
Good luck!!!!