Edit config.orig.php with your own data (such as databases adress, name, login and pass) and rename it as config.php
You may do the same with footer.orig.php

You can put some deck files in decks/default/ , they will appear by default in deck list for newcomers
You can put images in img/avatar/ , they will appear in avatar selector

I strongly encourage you to protect admin folder, with a .htaccess file for example, or even by removing it