I would suggest starting to understand the 'language' of the business. Consider a couple of visits to ATC units (not necessarily the biggest ones) and some PPL flying lessons (this is what I did). The PPL books mentioned above are also a good idea.
At the end of the day what you really need is enthusiasm be prepared to work hard from day 1 and remain motivated, even when it gets tough.
Most of the stuff they'll teach you is in itself simple; there's just an awful lot of it delivered over a short period of time!
Good Luck.