M4250 AV Line - get NDI Vlan routed to company network

Hello, simply i want my switch to behave like  any home wifi router, that has one WAN port connected to the internet router DHCP server (or company network)  and the other LAN ports connected to local computers. Wan ports gets DHCP address from the company network, and route internet traffic to and from LAN ports.

This of course is a little bit tricky to routing working on managed switch between Local VLAN and WAN Vlan, or maybe this is much easyer than i might think on 4250 AV line series, can't get this rigth though!

From "AV UI" WebIF

STEP1 : created  NDI VLAN 11 with Ports1 to 5

STEP2: created  WAN VLAN 20 with Port10 only

From "Main UI" WebIF , routing table shows the two network path

need to understand next steps

any help is wellcome!

cheers