Microsoft Windows Server 2003 Standard routing and remote access

I had routing and remote access set up on my domain controller (windows 2003 server r2 standard),  and I could no longer vpn into it.  I decided to delete and start over.  Now I am lost.  I have no idea how to set this up.  Please help.  I have dhcp and dns set up - I need help setting this back up.  None of my clients will connect.  Only my domain controler can get out to the internet.  Nothing else is talking..  I cannot even connect to the router (netopia) by plugging it into a cable.  I have to change my ip address to the router configuration in order to connect to my router.   It has been a while since I did this and I have no idea what to do.  I have a private address 10.0... on my dhcp range.