Hi there, and welcome to Armageddon!
The above has mentioned a few great points, already, and you, yourself, have a good starting plan set up. Joining the Byn, honestly, is what kick-started me into actually
getting the game (a bit) and surviving the more numerous rookie mistakes I would've made, had I not. The clan's a good starting point, especially if you're looking into combat. You'll learn the syntax right from the get-go, it being a combat clan, and being in a group full of PCs with more or less the same goals as your own PC can make the learning process go a lot smoother.
Honestly, I recommend joining a group (even if it isn't the Byn) or finding someone to partner up with. Interaction with other PCs is, I've found, a great way to learn the syntax, and there are those who'd probably be up for throwing some tasks for your PC to do--as long as they believe your PC could do it.
Otherwise, just some tips that might keep you alive: type 'help top40' in-game. These are a few commands and helpfiles that might help you out in the long run. Stay close to the walls. Avoid creatures bigger than your PC. Learn to distinguish high-ranking PCs
from the rest. Don't let your hit points drop below 2/3 of your max.
There's probably a ton of things I'm missing, here, but... I wish you luck, and I hope you enjoy it in the game.