Could you give an example of what I need for iptables forwarding rules.?
Nothing (to make it work), something (later to filter unwanted things). As you have ACCEPT in all sets, it's not breaking things.
One thing to check would be if the VPN client has a route for 44/8 pointing through the VPN ("ip route" on the client). The VPN server should give the client the route using a directive in the server config: