OMG, I was crying with you when you were breaking while talking about Sleeping in Light... It gets me every time. That episode is just... no words. Thank you SOOO much for doing this and vlogging about the series. I totally agree, it is the Best!
If you still want to stick around and enjoy the universe, I would suggest you...
1. Watch the first movie (I dunno which one that is: Thridspace or River of Souls - it does not matter, it is an easy watch)
2. Read the Centauri trilogy books - they will provide you with the conclusion to what happened to Londo and Vir after Season 5. (Highly recommended, as you love the characters so much!)
3. Read the PSI Corps trilogy books - if you want to know Bester's fate and his ending. (Not compulsory but a nice add-on.)
4. Watch the second movie: A Call to Arms - as it creates the bridge between the Babylon 5 series and Crusade, the spin-off series and it actually is the best movie for me.
5. Watch Crusade - the spin-off series. It has some problems in production value but the stories are solid and interesting. I would recommend watching it in chronological order of the episodes, not the aired order.
6. Read the Technomage trilogy books as the main character in those will be featured in Crusade, so you would need to get to know him first...
And mostly... just enjoy it! :) I know you will.