Conversation so far:
Where did Billy grow up?
Glendale Heights, Illinois.
Where did he attend school?
Marquardt Middle School.
Did Billy attend college or did he just go out to start a career in music?
Despite grant and scholarship offers from a number of schools, and a tuition fund left by his grandmother, Corgan decided to pursue music full-time.
Was he the only child or did he have siblings?
His parents had one more son.

Question: When he set to do music full time what was his first step?
Self-contained rewrite: When Billy started to do music full-time what was his first step?