Cisco 851W and remote client VPN setup instructions.

Our setup:

Cisco 851W, providing DHCP off a dynamic IP DSL line. One wireless network and a LAN in 10.10.0.0.

We want to be able to connect a variety of remote laptops to our network and then to the file server.

We’ll use 3DES, SHA1, DH2, and a pre-shared key. Can someone provide us with the idiot’s guide to VPN setup for this, either step by step or links? We’ve started reading the impenetrable 436-page manual but we’d like a leg-up as we sort this out.

Many thanks.