The theme is kinda easy
in the theme folder is a html file called template.html
that is the file you need to edit to edit the basic parts
then for a map for the php files ??
what you exactly mean with that ??
if you mean a sitemap then it can be easy created in html
but as the links are at current moment non seo and all scattered around the script is it maybe easyer to browse on the site and grab the links from there to create your sitemap
php is not as easy as it seems to be , it is easy to learn but before you can work on it you need to know what everything does or what everything is used for
if you like to learn php , then i can suggest to start with some basic scripts that you find on the net and learn from the code how it is created
http://php.net/manual/en/tutorial.php will show you some basic code and provide a idea how the scripts works
Greetings From PowerChaos