The Origin Story: While on a routine mission, two Jedi Knights discover a small boy whose midi-chlorian count is off the charts. They decide he's the prophesied 'Chosen One' who will bring balance to the Force and determine to train him.
Essential Elements Introduced: Heavy exposition tells us that even at such a tender age Anakin is a gifted pilot and engineer and has the ability to "see things before they happen". All of these things are very important.
Saved For The Sequels: Though a touch annoying, Anakin isn't yet evil - for that, he needs to go through loads of fear and anger and hate and suffering… or something along those lines.