Awesome, welcome! Your reflections are similar to how I felt when I first started using CODAP. What is your main purpose for using CODAP?
I recommend doing the Getting Started Part 1 and 2 tutorials, found on the For Educations tab on the main homepage. You can also directly open a link from the CODAP workspace (Open > Getting Started with CODAP).
Other than that, find some data that you are interested in exploring and see what graphs you can make. They have some neat activities on the For Educators page (sample data sets, data games, and dynamic data science) There are lots of cool features to learn, and also plugins to try and use. I recommend checking out the Microdata Portal and the NOAA Weather.
I also signed up for the Concord news letter and enjoy getting notifications when they have a blog post. Check out the blog here: https://concord.org/blog/
Enjoy!
Bridget