Scholarships and fellowships are grants awarded to students. You do not have to work for these. Research assistantships, teaching assistantships, and traineeships require the recipient to work in research, teaching, or in some other departmental activities. Another important question deals with the length of time for which a student can hold a particular type of financial aid. Also, if possible, find out how students currently in the program finance themselves.
Some universities allow the application fee to be waived.
Contact the graduate school of the university to which you are applying.