Business WLAN | G4100 V2

I have acquired a second hand G4100 V2 and would like to deploy it via an ADSL modem router, but I am having problems.
If I connect the wan connection on the G4100 to the ADSL Modem router, how should I configure the two devices?

Also, would it be possible to make the connection wirelessly? If so, what settings should I use?

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