Answers:

1. I can't remember first reactions anymore!
2. I love Emperor Turhan. I think he and Lady Morella were probably quite happy together. My head canon is that she was his third, and only personally chosen, wife. Chosen for love and companionship rather than political reasons.
3. Morden travels by Shadow ship and can be anywhere pretty quickly.
4. They generate their own jump gates and aren't limited to active ones built in specific places. So I think they can jump and re-jump and get around pretty quickly.
5. I think the war, being orchestrated and encouraged by outside forces, was inevitable. Londo however had chances to save his sould which he threw away until the end.
6. It is pivotal for Londo and G'Kar certainly. And the Narn-Centuari conflict will serve as a reason for many other actions that will lead us into the maor conflicts to come. It is really just an opening salvo. 'How will end? In fire.'