The easiest way to think about it is that it's a robotized gearbox
The clutch and gear change are electronically controlled by use of hydraulics
The main point to note is that the hydraulic oil (Petronas CS Speed Tutela @ £30/l) should be changed every 2-3 years and the clutch fluid Dot4 the same.
There are some very good guides by another member in the guides section
If you want Fiat to change the fluids for you, you will be looking at over £1000