In general, first you need to do a little research on Google. A general question like what is economics?
Then start reading definitions, one by one, creating a backbone skeleton of knowledge-no in depth details yet. Master the basics.
Then start going a little into details. When you see that you are starting connecting things in your head, that you have studied, it is a good sign that you are starting learning the subject.
Good luck, be patient and grab a cup of coffee:)