A best way for create a VPN service ,fast and easy is install and configure of Shadowsocks.
You can share your bandwidth to your users and start a business :-)
How to use?
First of all you should install python-pip ؛ so , open ssh and run this command:
After it you should install Shadowsocks with below command:
now you should config shadowsocks , so edit /etc/shadowsocks.json with this command:
change information like below:
At the end run this command for start shadow socks service
now you can connect to your vpn with this information.