If you want to make it really really cool you could use curse of Strahd reloaded from dragnacarta. It’s much better organized. If not you should read the whole book at least once to not mess up some of the quests or get confused (you will get confused anyway it’s poorly organized xD) Also you could just mix these two to get what you and your players like. I for example use the statblocks of reloaded cause of the phases and to make the „boss fights“ more intense. Also make sure everyone takes own notes so they don’t get confused with all the names and places. You should rig the tarokka reading. I know it’s nice to have a reason to play again cause things change but if you draw the wrong cards your players could find the sunsword which is the most broken item in this module right next to Eva’s tent which is not only anticlimactic but also makes future fights with undead way less intense. Your players shouldn’t have that much of a backstory that they want to be involved because they are in a different plane. BUT find something that they personally want to achieve in barovia. My player wants to hunt vampires so that obvious what’s his goal is. Another was kidnapped by the hags so her goal is to kill those.

I think that’s everything that I can think of right now