Where is this at?
Idk if I can link directly, but search projectdiablo2 dot com
Its the site you can download it and create an account on there. Youll run the game just like regular d2 but that site is where they have the trading market, the ladder list, armory(where you can see everyones gear and set ups) and then links to the WIKI. The wiki is also super nice, itll show you everything thats new as well as side by side comparisons for old items because they changed stuff around to make it more balance and fun.
So yea just dig around the wiki to see stuff and hop on the game when youre ready. Dont be afraid to ask for help and tell people youre new, people are generally helpful and friendly to newcomers honestly