For AliLaguna fares and schedules You can consult the
reference portal.
For vaporetto fares and schedules You can consult the
reference portal or the App
What a Bateo.
Consider that a single vaporetto ticket for non-Venetians costs €9.50 per ride. Consider buying a 1-2-3 day pass at the beginning of your stay.
They also exist
tourist passes that combine entrances to museums and navigation in the historic center. You can find them
here.