Lots of great ideas, so many topics though, and I'm not sure new players would want to spend a lot of time watching a whole bunch of videos just to make sure they cover every topic (since they don't know which topics they need to know).
My idea would be to have just a few videos total, sequential.
The first: Welcome to Armageddon.
This short video is actually someone creating a character from scratch, but the mdesc is already prepared so we don't have to watch them type it. Can just mention it was prepared, and we can see them CTL-V it onto the buffer. After completing the application (using a dummy account that has just new-player karma options), we let the viewer know that the wait for approval can take up to 24 hours but is usually shorter, and we'll just assume we're approved. Fast forward to the Hall of Kings process, the newbie shops, and then entering the game into the Gaj. Cut scene.
The second: Welcome to Allanak.
This one starts where the last one leaves off, except we happen to have handy a Byn recruiter looking for mercenaries, a House Jal recruiter looking for an aide, a Kadian recruiter looking for a crafter, a half-elven gemmed mage, and "random pocket-snatching elf #74."
In this video, we get to introduce basic syntax: sit, stand, sit table, sit at 4, sit #4, sit with amos, say, talk, tell, whisper, think, feel, and the difference between HIT and KILL in a bar. A narrator (whoever is making the video) will describe the scene while the screen scrolls the scene itself. Here we get to see how different types of characters interact.
The third: Malik gets a job.
This one is a continuation of the last, where each recruiter goes over their usual spiel that they say to pretty much any new character who says they need a job. The narrator explains why it matters, and what *kinds* of coded things recruiters are looking for when they're hiring (city-based house aides don't necessarily need warrior-based skills, but perception-based skills would be considered valueable. Bynners would be more on the other end of the spectrum. Crafting houses are -typically- looking for the ability to master - at the very least - some of the crafts that are specific to their house. So a warrior/master clothworker isn't likely to find much fun working for Salarr, and a ranger/armorsmith won't be much use as a crafter in Kadius. Emphasis would always be on the roleplay, the "why" of it all. But it's very important for new players to understand that code -does- matter in this game, and they will want their coded existence to be meaningful so that they can enjoy the roleplay of their character.
The last: RIP Malik, and Welcome to Armageddon!
Malik the newbie Bynner is minding his own business on a day off at the Gaj, and random elf #74, who remembers Malik from when he was fresh out of chargen. Malik, being a loveable but gullible galoot, thinks Elfy is going to be his VBFF and follows him to help move - and then share - a keg of whisky. Elfy apartment-kills Malik for his leet new Byn gear, and Malik's player gets Le Beep.
All of these videos could be made on the builder port, using dummy accounts and NPCs.