Hi look at this link for more details:
deploy to IIS
Short description is:
1. Publish your werbservice as a file
2. map the virtual directory to that published file
3. Map appropriate version of ASP.net framework 1.1 or 2.0
4. Make sure the iis and application pool is running.
5. Click on the Default web site hit the Run button |> it will start the web sites