From what I remember...
There's a loom which connects the two fog lamps together, and to the connector, which if installed (my 1.2 never had it) is in behind the headlight on the passenger side IIRC. Someone with a 172/non sport with fogs will have to confirm.
Two screws is all that holds in each fog light, should be pretty self explanatory. Fog light blanks should just pop off.
When you say you have the stalk already, does it have two fog light positions (as well as off) or just one?