Working part-time while studying abroad is very common. However, most students only start looking for jobs once they arrive at university, but there are actually several jobs available before flying to your new host country. You can easily find these positions by connecting with current university students. Often seniors are allowed to hire other students to work for them. If you can find these opportunities, you'll have a job before arriving on campus. 

These jobs can range from something in the cafeteria to an office job. All offices on campus will need assistants to help with filing, emailing, and receiving phone calls. You will need to do some legal work to become an official employee whenever you get a part-time job. So consider a 1-2 week buffer period when you receive the offer letter before working.