Rank Locked Text Whiteboard Script and GUI help

Have you ever played a roblox school rp and noticed they have a customizable rank-locked whiteboard to write what is going on in that class. My goal is to make my own version of these but I don’t know where to start. I see many drawing versions but I don’t want that I want a text one where you can write text.

Does anyone know where I should start or how I should start and code this? I know it is fairly simple but Ive never done anything like this.

My overall goal is to get something at the end like this demo I saw:

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