After understanding and deploying Sites, you can use the WebContactForm sample Visualforce page. You can use this page to test the functionality of your first site by setting it as the home page for your first site.
WebFormContact Page Detail

The WebFormContact is a simple new client intake form that displays a typical "contact us" type of form and submits the results to create a new Contact being created in the Advologix application, set with a Type = "Prospect". From here other capabilities of the system can be implemented such as workflow rules.
The WebFormContact page implements the following:
- Styles - to illustrate how regular CSS type styles can be included in your pages. You may also reference a CSS file and store it in the Static Resource section of the system
- Regular HTML and Javascript- Visual Force pages support all HTML markups and javascript. You can store your javascript files and libraries in the Static Resource section of the system.
- Visual Force Components - used in this page to illustrate the ease in which data driven components of your web pages can built with less complexity.
More information on developing Visual Force pages can be found using the online help when in edit mode of a Visual Force page and at http://developer.salesforce.com