You should not assume that you are automatically eligible to work in the United States. Unauthorized employment is one of the most serious violations of F-1 student status. Any unlawful employment - even for one day - even if you did not know it was illegal - poses a serious threat to your ability to remain in or return to the United States. You should speak with the Office of International Student Support before accepting any employment.
International students may work on-campus without applying to the USCIS for work authorization. Job listings for on-campus positions can be found in the O’Brien Center for Student Success, which is located on the 2nd floor of the Sakowich Campus Center. International students can only work a maximum of 20 hours per week while school is in session but may work up to 40 hours per week during any vacation periods.
There are three options for legal employment off campus. All students are not eligible for all options.