I think the lot of airbag activations are due to faulty connections to the drivers seat. Moving the seat back and forth can dislodged the connection to the seat airbag.
So I'd just check that all that is plugged in ok and then, as above, you will need someone with VAG-COM or a dealer to reset the warning lights. Simply correcting a potential wiring problem will not reset the light.
If it is anything other than a simple wiring fault then VAG-COM should also log the error that caused the warning light to illuminate and provide vital information on what the problem is.