This is also a good opportunity to read the novels. Action Stations is a prequel to the whole Kilrathi War from the perspective of shortly afterwards. Freedom Flight is concurrent with SM2. End Run and Fleet Action are between SO2 and WC3. False Color takes place between WC4 and Prophecy. The movie and game novels are concurrent with the stories they're about.
I thought the False Colors novel was set in the time period between WC3 and WC4. Admiral Tolwyn was in False Colors, but he was dead by the end of WC4.
And really, if you have even the dimmest recollection of what happens in Wing Commander IV, even the prologue won't spoil anything for you.