They aren't in chronological order, and they really aren't linked except by the over-arching theme of the game and campaigns by the same person (Vidmaster's campaigns have a habit of referencing one another to some extent). Thus there really isn't an 'order' to play them in, but when I first started off I really liked the Fortune Hunters campaigns, Earth-Minbari War, and Raider Wars. The Operations campaigns are buggy, the full drums of war has been released, which is a nice set. If you're completely inexperienced, I'd probably recommend TBH, since it stays fairly simple, and then move on to raider wars and Earth-Minbari war. If you're not a complete novice, FH2259/60 and Earth-Minbari War are good starting points, but that just means that Raider Wars and TBH are easier to me, at least. I play for fun, which means I don't play above very easy and thus don't see a lot of the nuance the higher difficulties bring. Dark Children and Survivor are probably the hardest, though. I hope that wasn't too jumbled and insane.
