It would be useful if you were to say what kind(s) of writing you have in mind. Creative writers are nearly always freelance (self-employed), for example. If you want to be employed as a writer, your best bet might be working for an advertising agency or newpaper.
A writer's job is to entertain and educate.
Writer's Identification
She is a writer.
he was a writer
He was a book writer
He was a mathematician and a writer.
He was a writer
New Orleans was his first job as a writer.
She was a writer
writer and novelist
Avi had one job a writer
He was a scientist, writer and politician.