I've done a bit of economics in my time, the hardest thing for me was the point where you've learnt the basic theory and then you're told "Forget it all, it's too general to apply to the real world."
Frustrating, but unfortunately necessary, from there is where we started to incorporate the variables.
If you had the patience, I'd recommend picking up a solid undergrad textbook and working through it at your own pace. i.e. "Economics: A Student's Guide" by Beardshaw, Brewster, Cormack & Ross.
That said bear the old joke "God invented economists to make astrology look like a precise science" in mind as a caveat.