sophos xg home port configuration for internet connection

Hi all 

im struggling with my sophos XG Home that is installed on a Fanless bare bone pc with 4 NICs.
My Principal goal is to set my router in Bridge Mode, herefor my ISP is sending me a Fritzbox because the standart router dont support this mode.

Anyway, waiting till then i wanted to play around my brand new Firewall, so i connected the Router with the Firewall, firewall Port config: LAN.
Now i wanted to connect a Laptop to a second port on the Firewall that is configured as WAN - the problem is i dont receive any internet connection 

As im new in the Firewall World i just need help 

Thank you in advance guys!