MassGIS Oliver can give you a rough estimate of the wetlands located on your property: http://maps.massgis.state.ma.us/map_ol/oliver.php
To use, type address into the bar labeled "Search for a location" and hit enter. The approximate location of the wetlands are indicated by blue patterned areas. The approximate location of beaches are indicated by yellow/orange patterned areas. Open water is indicated by solid blue areas.
FEMA Flood Map Service Center is the best way to determine whether or not your property is in a flood zone: https://msc.fema.gov/portal/search