I'm a not-so-starving artist working on future NY Times

[Aikuzo]

"I'm a not-so-starving artist steadily working on writing future NY Times bestsellers"

I don't get this sentence.... first he says he's not a starving artist [i](ok), steadily working on "writing" (I thought he's an artist, how come it ends up in writing?), future NY Times bestsellers (does he trying to say he's a writer who is not "well known" yet but working his way up to writing NY T bestsellers in the future? And BUT still financially ok), and one day achieving literary rockstardom.(means he believe he'll be BIG someday?)

[Josef]

"I'm a not-so-starving artist steadily working on writing future NY Times bestsellers"

I don't get this sentence.... first he says he's not a starving artist [i](ok), steadily working on "writing" (I thought he's an artist, how come it ends up in writing?), future NY Times bestsellers (does he trying to say he's a writer who is not "well known" yet but working his way up to writing NY T bestsellers in the future? And BUT still financially ok), and one day achieving literary rockstardom.(means he believe he'll be BIG someday?)

One meaning of artist is: someone who practises any of the creative arts, including sculpting, fiction-writing, poetry, music, filmmaking...

All the rest you have about right.