Jonny - you're going to love the 240 HD
. Excellent choice!
Regarding care - it's a true laser so be careful not to torque the blade during cuts or especially if it sticks to the board a little. No bones, no frozen foods, etc. Don't use the edge side to scrape or move product around on your board - use a board scraper or turn the knife over and use the spine side.
This son of a gun is going to be sharp - know where your edge is at all times. For example, don't lay the knife on your board with the edge pointing toward the middle or you could cut yourself while handling product etc. if you accidentally graze the edge. (Guess why I mentioned that specific example
The HD2 steel is not stainless, it's semi-stainless, so don't let water/moisture sit too long on it. If you wipe it after your cutting chores and clean it when you're done, it will essentially behave as stainless.
On sharpening - if you have a strop or two, you can probably get away with stropping for a while before a real sharpening session is needed. The edge has a very small bevel because the knife is so thin, so it won't take much to sharpen it. Use your sharpie trick on the edge pro with a high grit dry stone and very light pressure to find the bevel angle and match it. You can probably start with a 1K stone for your first sharpening if you keep it in decent shape with a strop. Try to remove as little metal as possible and use light pressure on the EP. I like to cover most of the blade sides with blue painters tape 3/4 down to the edge to keep the EP sharpening process from scratching the blade.
Have fun and enjoy!