Connecting Remote users

I have been asked to quote for an office LAN setup.
I have to supply and config. 6 laptops with MS office and Norton AV. Supply and config. Win2K3 server and two printers. All this is no problem.

I also have to connect these 6 laptop users remotely.
How do i connect these users to win2K3 server?
What are the requirements for a VPN connection?
Do i need a static IP address to the ISP for the Router?
I was thinking of using a Sonicwall Router.
What is the typical charge for this sort of project.

If anyone Techrepublic member out there can help out on this one i would really appreciate it.
Balbir