For finding which template is which:
http://forum.x-cart.com/showthread.php?t=21529
Also, webmaster mode will tell you exatly which templates are which, and then you can add/alter the CSS as required.
As for search, you should have seen how bad the old forum was...this just requires you to have boolean turned on as outlined in the thread above. FYI, that is mentioned in the 'new to X-Cart - read this' thread.