Hey, welcome to the forums. Make sure to scour the Help & Info section in more detail. You'll see articles that have examples of using variables. When you want to make a storygame, go to My Stuff -> Storygames and start a new one. When you want to write a script, you can add it under Scripts if you want it to execute every time a page loads or every time a link is clicked. Alternatively, you can start a page and attach scripts to the links when you click them (which of course only belong to that page).
Scour around for solutions to your problems first. Ask only when you have a pointed question (this is life advice; apply liberally). Otherwise people that might want to help will end up suggesting things all over the place, since it's unclear where you're stuck.
Have fun!