Completely Green... But willing to take the plunge

The thing is... I can see that the field is promising, fast-paced, and challenging, and I really wanna get into it, but I'm all about measured risks. I want to know a sure-fire way how someone with ZERO KNOWLEDGE on the topic of IM can go from that point up to his/her first campaign. Being the complete ignoramus that I am, I'm studying for the Google Adwords Fundamentals Qualifications Exam.
Would you say this is a good first step? No? What else would you suggest? What then?
Thanks so much in advance guys!
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