Seriously - check your windows help files for info on how to get your webpage up and running on your computer. The helpfiles are really good and it's an easy thing to do.
As far as your linksys just go to the configuration (http://192.168.1.1 by default) go to the advanced setup and be sure port 80 is forwarded to the IP of the computer you want. You should be good to go. You might have to switch to fixed ip addresses instead of DHCP to get the forwarding working on the linksys.