I think you must begin using blueprint for learning the concepts, functions/api and how works the engine and some basic book about c++ if you don’t known c++ (nothing engine related for begin). That going to be fast for learning engine and game concepts than use C++.
In few months or a year, depend of dedication time or learning assimilation, when you are comfortable with blueprints and working with the engine jump to do small things with C++, your own bp library by example.