Rather than trying to set up a true bridge, it's easier just to assign the new router a static IP address and make that the DMZ (port forwards everything to that IP address).
e.g. If your Netgear is 192.168.1.1
■Give the WAN port on the TP-Link the static IP address 192.168.1.2. The TP-Link's LAN IP range cannot be 192.168.1.x, (same as WAN) so just make it something like 192.168.2.x.
■On the Netgear, set DMZ to 192.168.1.2, and turn off its WiFi
■Plug the WAN port of the TP-Link into a LAN port of the Netgear
The DMZ setting sends any incoming connection requests to the TP-Link, so it's just like the TP-Link is directly exposed to the Internet. If the TP-Link doesn't have guest WiFi capability and you want it, you can leave the Netgear's WiFi on and make it a guest network.