So... You are using website builder and you delete the template completely?
It's very obvious that with empty template you'll get empty page.

If you don't want to use Site Builder anymore - delete the Site Builder files completely (in 110mb CP with File Manager or trough FTP) and upload your own files (HTML/PHP/etc.).
If you still want to use Site Builder and recreate your template - in 110mb CP under "Step 1...", "Step 2..." there is "Help" link. Following the tips about adding new domain to the license you'll find a method to also add new template, if you completely remove previous one.