This is a bit more complicated, as may some people think. So I am here to guide you trough this process, but there are some requirements you (your internet connection/your ISP) need to meet. I will not be explaining the whole thing as it is, because it is unnecessary and time consuming. I will go with you trough setup step - by - step.
So, first requirement is: You have to have PUBLIC ip (not to confuse with STATIC ip, as this is another thing). How to find out if you do have public IP? Well:
- Go to some website that will show you your IP for example: https://www.whatismyip.com/
- Open your router settings (navigate to 192.168.x.1 - usually), and look for something like “Internet address” or “Gateway IP” or if you will be not sure wich one is that right, just post screenshot here.
- If your router internet IP matches IP displayed by whatismyip website, then you very likely meet first requirement, IF NOT, then it is very likely that you are behind double NAT - read - screwed.
After this I will tell you what is your next options - good luck!
P.S. This has nothing to do with ports, or your sketches for now.