The first thing your webserver needs is something to serve. You must have at least one HTML page to determine whether your webserver is operational. If some or all the pages are to go in the VFS, you should first set up your makefiles and HTML compiling in an organized manner.
You can start with one or more pages. They can be created using any HTML authoring tool, or built manually with a simple text editor. If you want to begin coding right away and do not have your own pages, you can use pages from the demonstration program (see Demonstration program). HTML links do not have to be resolvable for you to prototype a server, but any graphics files your pages reference should be included.