I want to control some digital outputs of Arduino trough the Internet with a smartphone or a laptop etc... but this arduino may be in a school or in a house of a friend, etc... and i couldn't program the router of school for example.
So i need to do that we are talking about right?
But i'm a bit lost 
To start i'm thinking to create a website with login, and inside will be some buttons to send data to the arduino.
I need to buy a vps to be my web server?
After i will program my arduino to connect to a web server periodically.
I'm thinking right?
help 