You can find information about public transportation around Zurich at the ZVV website. Please make sure you have a valid ticket before you board a train, tram or bus. You can get these tickets from vending machines or ticket counters at the Zurich Airport and Zurich main station (on buses with 3-digit numbers you can buy a ticket from the driver if there is no ticket machine at the bus stop). There are random ticket inspections on trains, trams and buses and you will be fined 90 CHF (plus the ticket) if you are caught traveling without a valid ticket—no exceptions made for foreigners.

Timetables and fares for public transportation throughout Switzerland can be found here. Enter, for example, “Zurich airport” as the point of departure and “Ruschlikon, Saumerstrasse” as the destination.