Nouns

(n)introduction, debut, first appearance, launching, unveiling, entrythe act of beginning something new“they looked forward to the debut of their new product line”
(n)debutthe presentation of a debutante in society

Verbs

(v)debutpresent for the first time to the public“The band debuts a new song or two each month”
(v)debutappear for the first time in public“The new ballet that debuts next months at Covent Garden, is already sold out”
(v)debutmake one's debut“This young soprano debuts next month at the Metropolitan Opera”