Expert in dd-wrt Router Setup required

Job ID: 36742875

Budget: $14 – $30 NZD

I am needing an expert in dd-wrt to setup a router/switch.
If you don't know what dd-rt is, or not an expert this project is not for you as this requires custom setup and fault finding.

I have a router setup with the latest dd-wrt firmware, but am having trouble with the custom setup.
I am joining 2 sites/networks, each with their own gateway, and own DHCP server.
What is needed is;
1) Disable DHCP server on the switch/router (already done) as DHCP server is elsewhere on local network
2) Setup the 4 lan ports as a ethernet switch (currently doesn't seem to work as a switch/router)
3) Setup one lan port, or the WAN port (as local ethernet port) to block all incoming and outgoing DHCP request
4) Setup Wifi to connect to and allow DHCP requests from local network

See attached diagram

I have access to the GUI and hope that using Teamviewer would be sufficient to complete this work