DataTank is a large program. The tutorials are intended to give you a sense of how it works, both before and after you have started using it, but there is a lot of functionality that is not covered in the tutorials.
To get started, contact sales to set up a trial license. This is the full version, but will expire. You are urged to ask questions during the trial period to get up to speed quickly.
This is done to be able to better understand what people want to use DataTank for, and to make sure that if there is something that DataTank is not able to do at this point that it can be added to a future version. The framework in place can be extended well beyond the 1,400 modules currently in the program, and new functionality is constantly being added.