I am Professor at the Department of Computer Science in Brazil. I am teaching IoT with raspberry, arduino, some IoT protocols and VPNs with OpenVPN. I produced a material to learn how to create a linux machine in Amazon and how to configure OpenVPN in Amazon (VPN server) and in Raspberry (VPN client).
This tutorial allows you to configure the devices and remotelly to access the raspberry or others VPN clients connected in VPN server.
So you can buy my documents (tutorials) in pdf and yourself will be able to create a VPN in Amazon and configure VPN in raspberry.
If you want only the material in portuguese, the value is only $50 + fee and you will receive in same day.
If you want only the material in english, the value is only $100 + fee. I will translate the pdf and you could send to my mail until 6 questions about tutorial in 3 days. In other words, until 2 questions per day.