Hello Olayinka7,
In addition to what Tresh has said, I will be chipping in some more information relating to the course that best correlate with your undergraduate study. As a Journalist, you can further your study in Media Communication, Linguistic, Public Administration, Public Relation, Copy Writing and editing, Sociology etc. You can use Google for more panoramic insight.
Mind you, if you're a matured applicant with work experience and with study gap(s), you may want to consider to for a course that best relate to your work experience. This make it less tedious showing study progression and clear purpose on why you want to pursue the course in spite the huge expenses.
Don't make the mistake of applying to programs that requires supervisor without securing one. Not that its impossible to get admission in such way but it won't come any easy. Another advise, expand your school search and trying applying to more than one school.
All the best