Point To Point Wireless Configuration

I am from a third world country, and we dont many experts in the field of WAN.

I want to establish a point-to-point connection between two offices (about 8Km apart)and I have the following items in place:-

(a) Two Speedland 8400 Router/BridgesRadios -(11Mbps, 25Km Range, With all neccessary accessories)

(b)A windows 2000 server OS.

(c) A Router Software capable of Network address translation (NAT).

(d) A 64kbps VSAT internet connection at one of the offices.

Please can anyonelet me know what to do to enable the second office share the internet connection through the two Wireless Radios ?.