I would like to know how to deploy or what are the steps that are involved to deploy a classic asp website in IIS 6/7
Can we create an installer for the existing project?
Copy the files to the virtual folder. If you have any depending dll's or exe's make sure to install them too.
As you said you may have to create an installer that will do this works to you. There is a lot of installers out there, like Inno Setup and Windows Installer.