Basically my understanding is that determinists believe that all events are predetermined by an ancient series of events (big bang, original cause and effect, whatever), AKA fate. In other words, every event in your life has been made possible only because of past events, a simple example: if i'd never been stabbed, i wouldn't have met the hot nurse I married, who would have never introduced me to Hugh Hefner; therefore getting stabbed inevitably led to meeting Hugh Hefner.
The real battle isn't really det. vs. free will as much as it is to what degree a person accepts pure determinism. This is like 101 shit, maybe someone else can elaborate.