Hi
You just turn up and wait your turn. It usually isn't that long a wait

Ferries are also very regular and you now pay at the Gozo end rather than at Cirkewwa.

Excellent - thanks for the info.

The ferries depart every 45 minutes so if you miss one the next isn't far away, this timetable will give you the times http://www.gozochannel.com/timetable.asp?w=0

If you are hiring a car it is very easy to get to Cirkewwa in the North of the island and on to the ferry, if going by buss that is where the bus stops.
When you arrive at Mgarr in Gozo and if you don't have transport there are taxis waiting outside the new ferry terminal and there will also be a very reasonably priced public bus that takes you in to the Gozo capital Victoria from where you can connect with other bus routes.

Graham