How to use 2 Internet Connections on RDS

 Hi

I am running a Remote Desktop Server in the office we currently have 2 x Wans

1 - ADSL2+
2 - EFM 10/10

What I would like to achieve if possible on this terminal server.
The EFM 10/10 Is used purely for remote users to make and use a connection
All internet traffic other then this to use the ADSL connection.

I was thinking you would have each connection setup on a separate nic, Then block ports with the firewall for the EFM? but I am really unsure