Anyone knows how to work with twine?

im trying to build a game, but i want it to look like text messages. The player (you) will make decisions based on what information you’re given. Also you talk to NPCs.

if anyone dont get the idea  its like the two games above:

i am innocent

Mystic messenger 

Im not sure how to use it and I’ve watched many videos but i dont seem to find any good once.