Need some advice on an assignment.

Honestly networking is my Achilles heel. I currently have Security and this assignment is giving me a major ass head ache.

I have no idea where as to start even.I am not asking for someone to do it, just to guide me in a direction or which some pointers.

The project aims to design and implement security on a data centre. The data centre has 3 servers, each of which host different services. The services on each of the servers are DNS, FTP and HTTPS. Each of the servers have unique public IP addresses. There are also 2 network administrators on the network who manages and troubleshoot any issues on the server.

Requirements

1. The data centre servers and admins should be on different network.
2. The servers should be accessible from the internet using public IP address.
3. The servers should also have private IP address using which the admins access.
4. The private IP address of the servers should not be accessible from the outside network.
5. All communication to the outside network from the server network should be through the respective public IP address.
6. External users should be unable to access the LAN network.
7. Data centre security proposal.

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My first thought was to build the layout on draw.io. And then go from there to complete it. By assigning the Ip address.

https://imgur.com/pPKJXwS this is the first layout I tried making