Welcome to the team, Wiesty. (And everyone else too. Thanks in advance!)
The Audio team will be responsible for:
1. Casting. This means finding and evaluating voice talents.
2. Voice directing. This means getting the cast to record their lines (and rerecord as necessary) in a timely manner.
3. Sound effects. This means determining and creating/finding the necessary sound effects.
4. Soundtrack. This means creating/finding the musical accompaniment.
Of course, since you're the team leader, Wiesty, it's up to you to decide how you want to go about doing all of this.