Good question.
If you feel like you don't remember the basics, maybe go through the tutorials linked on the homepage.
If you look at your old code and there are just a lot of properties, attributes and whatnot that you're not sure what they do, look them up in the quickref document.
I wish there was a comprehensive manual that explains PunyInform from the ground up, without relying heavily on the Inform 6 documentation, but unfortunately we're not there yet.