PIA-Launch is a simple wrapper for OpenVPN for use with Private Internet Access on Linux.
Copy the contents of the /etc/openvpn directory here to your system. The resolv.conf file used has the DNS servers for this service. You may modify this file to point to another DNS server if you wish. Then, edit the /etc/openvpn/privateinternetaccess/auth/credentials.txt file with your login/password. You may want to chmod this file to protect it.
Last, download the setup files from Private Internet Access here and place them in the directory /etc/openvpn/privateinternetaccess/. The script will provide you with a list of servers to choose from when run.