Basic question, how do I access scripts in unity. Specifically their methods.

So for example, if I wanted to go from a choice in the script to a combat scene. How would I from ink make it start the scene in unity where the code there could take it from there.

Another question, sorry, like most RPG's the game I'm working on has different stats. Like, for example, if I have over 7 strength then a character might say, 'wow you're strong' how do I access that variable and how do I have the text change because of this.

I hope I laid my problems out simply and that there's a simple solution, as I said. Totally new to this.