To tell the truth, the best place to learn would be at wcnews.com (the CIC). They have extensive archives that have no peer when it comes to their attention to detail. So, look at what they have there, and you will be able to find out all you want to know. They have walk-throughs of each of the games, entries on all of the characters, information on ships, technology, tactics, background details, electronic versions of game manuals, etc... I know of no place that offers an equal resource.
You may also be interested in the Wing Commander novels. Both WC3 and WC4 were made into novels, and there are various others.
I'd also recommend playing Standoff, and giving the Privateer Remake or Privateer Gemini Gold a try (or Unknown Enemy, if you are feeling suicidal!)
But, as I said, that really is the best place to go for information. You don't have to be a registered member to get the information. Just click on the links on the right side of the screen.
Oh, and thanks for your support of WC Saga! We hope you will enjoy it upon its release.