Okay, you’re starting as almost everybody else here, nothing to worry about. Just download the choicescript game demo/ debugger from here Github-Choicescript-Master. Extract all to a folder somewhere where you like, then go to the \web\mygame\scenes folder where you’ll find a bunch of *txt files. Those *txt are a game demo, you can open them and see how it works and then start to modify them as you start creating your story.
You have a lot more help in this post
The title card thingy, I guess you’re talking about the title headers for your book and chapters? If so, here’s a guide you can take a look at to make your own without having to buy anything.