During her Chicago days, one of the other residents in Linda Danvers' apartment building had the bad fortune to to be a young actor with a side job as a courier for a corrupt businessman:
So Kupperberg decided to give his buddy a role in the comic he was writing. Of course, one of the perks of putting a friend into your comic book is that you can rag on him a little bit:
Plus, that irresponsibility gets him kidnapped and beat-up by super-villains:
Thus, in answer to the question "how do I break in to comics?," the answer is a) know someone in the biz who will actually put you into comics books, and b) live in the same building as Supergirl!
From The Daring New Adventures Of Supergirl #4-5 (1983)