Creating a Phone/Messenger Simulator

I want to create a phone using Twine. I’m planning to make a story that progresses through messages, but I have no idea how to start. I know that something like this can be done with Twine because I’ve played a game like this before. Is there any guide on how to do this? Or should I just learn some basics and rely on my imagination? I’m not planning anything too complex. Just a main screen, a messages section, and various conversations, along with a gallery where photos shown in the chats are stored. That’s all. Lastly, is this an advanced-level task? I know almost nothing about Twine, so how difficult would it be to create such a game?

Note: This won't be a messaging bot. I'm thinking of a story driven more by the player's choices.