Welcome to the Cayenne Community @cregini, glad you were able to get past the Pi Agent install issue you had. I'm surprised that making a new account did it (without making some change to the Pi), but I won't argue with success Certainly if the issue re-occurs in the future let us know what your terminal output looks like.
As far as Tutorials, you're likely looking for this section of the site: https://mydevices.com/cayenne/videos/
There we have all sorts of walkthroughs on adding devices/sensors/using the different features of Cayenne. If you have any questions about any of them, or run into something that wasn't covered, please feel free to make a thread on the forum and we'll help you out.
We also have this Projects section which you may have already found, where you can see completed projects from other users and staff, and get some inspiration for what you might want to build yourself.