Congratulations on your graduate school start! Financial aid (scholarships included) in graduate school is a bit different from the undergraduate experience.
Graduate students tend to center their studies around a specific professor within a department, so discussing a graduate assistanceship or fellowship with your main professor or the department chair would be a good place to start.
Depending on your area of graduate study, there may be other departments within the university that are also looking for graduates who can provide assistance such as student affairs, athletics, student union, etc.
Although a bit tougher to find, there are scholarships available to graduate students on the larger scholarship search websites...
to name a few.
Good luck on your search and in your educational endeavors!