Google Maps is generally reliable for bus schedules, but here you can find detailed info
Bus stops are marked by green signs with the name C30, one per direction.
You can buy bus tickets in shops and bars. Some bus driver will also sell you tickets with a price increase, but they are not required to do it.
N.B.: We suggest you to buy the tickets before boarding, if possible.
To and from Bellagio: ~ 1.80 €
To and from Como: ~ 3.00 €