Is vocational school worth it for getting a good job?

I don't have a degree but I know japanese language. I always wanted to become a manga artist and create anime.

If I go to a manga vocational class of 1 year, can I get a job? Will I be able to make enough money to support myself. Because some people mentioned that even you manage to get a job, it only pays the bare minimum and sometimes you even need to do part time jobs as well to get enough money.