If you're playing the Dungeon Master in this affair you'll be well served to read everything over beforehand and get some idea what you're in for, but new players should pick this up fast as they go. You fill out your character sheet over time, get used to how stats are calculated and what they're used for, basic combat, minor roleplaying, all that good jazz. The fights are well balanced if the players aren't too thick; my group almost wiped on the first room because they couldn't focus fire or protect their wizard but after that they did fine with no prior experience. Got your map, plenty of monster tokens (more than you'll need, really, although I hope you have a chess set for one room), dice, character sheets (only four so be ready to photocopy), standard dice set, and cards representing all the abilities plus a few items. The book walks you through a lot of content and gives you the freedom to expand on it too, since the adventure is very open-ended.
Amusingly, when I ran this the final encounter started (literally started, since the Fighter had a 21 initiative) with the Hulking Zombie getting one-shot with a critical axe swing. That's how it goes sometimes; roll with it. :)
I'm sure there's a few videos of this being played on YouTube, which again is worthy of your attention if you're the DM and need to run the show. So if you don't mind the content being ruined a bit for you, go check that out too if you're still unsure if you want to buy.
In a nutshell, you can find a lot worse games for seventeen bucks. Good price if you want to try something new. If you already play 4th edition it's no use to you, unless you want a vehicle for introducing new people to the game.