1. currently the game is not licensed under creative commons, but there is a revised edition in the works that may or may not depending on feedback.
2. as of current rules, you're encouraged to make up your own monsters and enemies. There's plans for modules with enemy stats in the future, or if you'd prefer we have noticed 5E statblocks are a serviceable alternative in a pinch.
hopefully with the soon-to-be-released revised edition as well as some prewritten modules, things will be a bit more clear. thank you for taking an interest in our project!