Trial and error.
That's so far best way to learn almost everything!
Unfortunately, when you buy an ebook, it usually ends suggesting two or three new ebooks to buy. If you only read while you wait for "feel ready", you'll spend monthes or years reading and reading.
So I suggest analyse how some IMer well-succeeded started and try to do samething. So, during your journey, fix wrong things and try to learn what is really needed, otherwise, information overload will freeze you.