Question : How to setup firewall and vpn

I want to setup a firewall and vpn which are included in the same box. I have a motorola modem and wireless router (combo) which is in the same box. I want to setup a firewall so my question is where should i setup the firewall and vpn.
!---------------!----------!
firewall      router    <----dsl


So if i setup the firewall as i mentioned above can my network be secured because all the devices are connected through wireless.    

Answer : How to setup firewall and vpn

Arbasoft AD,
i would your question your approach towarnig accomplishing high availibility with three nodes, this solution does not make much sense to me. and there is no documentation to accomplish that. can you please share your motive behind 3 nodes
2007 uses a clusteredmailbox that revolves around nodes... there are no virtual servers as they used to be in earlier versions
so there will be one active node. and other two may be left passive. i would say this would be heck of waste of resource
so go by two nodes.

Thank you