Install VPS (Debian/Ubuntu) for Drupal multisite - nginx, php-fpm, microcashing, mysql etc. - repost

Looking for someone to install a Debian / Ubuntu little server (512MB RAM and 1 thread Xeon 1.80 GHz) for multidomain Drupal sites. All setup feature by this model [login to view URL] + some good firewall + ssh or sftp file client support + phpmyadmin client support + backup websites and databases to another server disk and automatic deletion of older versions I'm not so much a professional in Linux, so please also short guide how and where possibly adjust the setting + to add a new domain setup.