Share internet between two Vlans on a netgear GS724TV4

Hi

So I been trying for altmost 2 days to set up my netgear GS724TV4, which is a managed layer3 switch, but does not have capability to create a DHCP server. 

I am running a webserver and email server, and would like to seperate this from my private network, in case of hacking. So I though I would make two Vlan, lets say vlan1 for private and vlan100 for the server.

ISP fiber to my house -> deco X10 setup (internet Vlan id 101 - 802.1q tag) -> unmanaged layer3 switch that provides my netgear with 2 patch cabels in port12 and 13

I have attached a screenshot of my setup and here is some info:

port 2 and 3 my private network.

port 12 and 13 - Conntect to an unmanaged switch, where my internet patch-cable is connected.

port 24 - my server

Since I dont understand inter-routing my idea was to have 2 vlans, where vlan1 had port 1-12 untagged and vlan2 had 13-24 untagged, and both vlans would get internet via port 12 or 13.

Could somebody tell me if and how to set this up?
Help is greatly appriciated