How To Stream Live Video Feed From Raspberry Pi To Remote Server?

I am working on a senior year engineering project which aims to decrease porch theft. The goal is to implement an IoT solution. I am trying to stream a live feed from a Raspberry Pi 3 B+ to a server so that the users can see their front porch from their Android device whenever they want and also receive a notification when there is someone at the door. I created a droplet with Debian and connected two different devices. However, I have no prior knowledge about streaming or managing a server. From the tutorials and previously asked questions I was unable to find anything that works for me. I will appreciate any suggestion or material you think that can help me.