Trying to get files from the old site
Assuming your site is a Drupal 7 site 


Make sure you have .htaccess in your project root. You can get it here - this should fix the access denied errors
If you have drush, run: drush cc all - this should fix the missing CSS (Drupal doesn't really serve pages directly, it makes cached versions of them. I'd say you caches are empty to they need to be rebuilt.


(If you aren't able to clear / rebuild the cache with drush, please try some of the alternative steps outlined here)