Quick Start with eXtension Templates
Step 1. - Download Quick Start Example
You can find it here. You also need to download source for XTP from here.
Step 2. - Unpack both archives into your webserver's root directory
For location of your webserver's root directory you may need to consult its documentation. In the example's source it is assumed that xtp.php is in the same directory as example files.
Step 3. - Look at index.phpx, component.phpx
Index.phpx is example of page template, component.phpx is example component that is being used by main page. Both files contain further comments to make it easy for you to understand what is happening.
You may want to experiment by changing example files or you may start your project by using them as simple skeleton.