At the beginning is not a full time job but it takes time to get to castings. Sometimes you have to go to 10-20 Castings to get your first job. Are you able to do that? If you work with an agency, the best thing is - that you have time to go to casting. If an agency calls you 3-4 times to go to a casting and you always tell them " sorry - no time" then you should not be in the modeling industry.