VLAN Setup

Hello, all.

I am trying to setup my own router with a static IP (purchased 5 from AT&T) behind my Arris NVG599. I have been able to get as far as to setup the static IP on the Arris under Public Subnet and set the DHCP range to the single IP of my router's LAN port. I also setup IP Passthrough with the default server pointing, again, to my router's LAN port. The router is now handling DHCP and routes all traffic behind it to the internet, showing one of my static IPs are the external address. This is great, except for the fact that my TVs don't work anymore.

I was thinking about setting up 2 VLANs; one for the STB (all ethernet connections) and one for my other devices.

In order for this to work, I think I need to leave DHCP on the NVG599 with a range of 3 addresses for my STBs and also have DHCP on my router for all other devices. Since these 2 servers would be on different VLANs they shouldn't see each other and overlap, right?

Any help is greatly appreciated. I am extremely frustrated with this and even went through the lengths of trying to ditch U-Verse and get DirecTV installed today. That was a complete different mess and the technician didn't install it. I now have to wait for a contractor to come out as the DirecTV tech couldn't install the satellite on my roof.

Thanks in advance!

P.S.
It seems as if @SomeJoe7777 is the expert in this ream so here's to hoping he sees this.