The man's nervousness depicted that it was the first speech delivered by him.

One word substitute is Maiden.

Matin: a Christian service of morning prayer, especially in the Anglican Church.
Peroration: the concluding part of a speech, typically intended to inspire enthusiasm in the audience.
Maiden: being or involving the first attempt or act of its kind.
Platitude: a remark or statement, especially one with a moral content, that has been used too often to be interesting or thoughtful.