You should be on the side of the tram tracks further away from the ETH main building. You can either buy a single ticket valid for 1 hour or a day ticket valid for 24 hours. Since the day ticket is only twice the cost of the single ticket, it is often more economical to buy the day ticket. There are several different ways of choosing the day ticket on the ticket machine. The ticket machines accept only coins unfortunately.
Tickets have to bought before boarding since no tickets are sold on trams or buses.
Tram 9 and 10 runs every 7 to 8 minutes during the day. You will need to cross the tram tracks to get to the bus stop for Bus 69. There is a great view of Zurich city along Bus 69 route on the left side of the bus. You can even see the Alps on a clear day. Bus 69 runs every 7 to 8 minutes during the day.