The internet toolkit has some functions for generating and manipulating HTML, but it isn't really intended as a Web page authoring tool. I personally wouldn't use it for such a purpose, and I've done a good bit of Web programming in various different environments, including LabVIEW.
The true power of the internet toolkit lies in its ability to create LabVIEW VIs to handle CGI requests, the way that perl or PHP might be used in more traditional Web development. In the old days, this was really the only way to provide Web interactivity with LabVIEW on the back end.
Here is a document that outlines how to start up the toolkit's Web server and check out the CGI examples that ship with LabVIEW. This is the best jumping-off point for creating your own pages, if you are planning to use the CGI functionality in the internet toolkit. Just examine how the HTML pages and the CGI VIs in the examples work together and begin to try out your own VIs.
Since LabVIEW 6i, LabVIEW has shipped with Remote Panel functionality that allows you to publish any LabVIEW VI in a Web browser without the burden of creating special CGI functionality. Furthermore, users can fully interact with the VI--buttons, graphs, string controls, etc. That's really a better solution if you want to make VIs available via the Web and aren't so much interested in CGI/transactional behavior. Check this out by choosing Tools >> Web Publishing Tool from LabVIEW.
I hope this info gives you some ideas about starting points for Web functionality in LabVIEW. Please follow up if you have more specific questions.
Best Regards,
John