Hi
First, if you haven't already, read how to make a child theme here: http://codex.wordpress.org/Child_Themes
After you've created the child theme just copy over the footer.php and edit line 21 for the footer copyright. Then, to fix the read more, read this: http://codex.wordpress.org/Customizing_the_Read_More You'll need to find which file in the theme uses '<?php the_excerpt(); ?>' and edit that file most likely.