VPS maintenance

Need same exact work done on 2 new VPS. Both have under 10 Wordpress sites. All sites run fine, just need a few tweaks below to the VPS in order of importance.

Stats: 1gb, Debian 7, 64 bit, Nginx, Php-fpm, Mysql.

• Need logrotate setup for various VPS logs and for all sites using wildcard method mentioned below. (/srv/www/*/logs/*.log)
• Find out why and how to fix issue with 2/3rd of memory being used.
• Find out why one vps gets a CPU spike each day causing me to get a notification.
• Configure Munin to be at http://IP/munin with password protection. Munin has just been installed, but nothing else.
• Also interested in hardening now that I have some sites up and everything appears to be working good.
• Any other recommendations….
• Looking for someone I can reach out to in future for paid support if needed.