Nouns

(n)enterprise, enterprisingness, initiative, go-aheadreadiness to embark on bold new ventures
(n)first step, initiative, opening move, openingthe first of a series of actions

Adjectives

(s)inaugural, initiative, initiatory, first, maidenserving to set in motion“the magazine's inaugural issue”, “the initiative phase in the negotiations”, “an initiatory step toward a treaty”, “his first (or maiden) speech in Congress”, “the liner's maiden voyage”