hi Jey
For installing your own template you have to create the following files
1. Index.php(important)
2. templateDetails.xml(important)
3. Style.css
4. Images
then you have to convert that folder in to zip file. then login into the admin panel, select the installer tab, there you have to select site template option then upload that zip file, make your template default. You will see your template in your site

Regards
Falcon