This map is made for Warlocks ruleset only. You can play as either the Elves, Highmen, Undead, Dark Elves, or Human. The object is (of course) wipe out everyone else. Best played with leaders on map, exploration off, and do not customise the leaders. But hey, it's your freetime, do what you want!
Elves - Drizzt Do'Urden needs to find his friend Regis, who can use his ruby pendant to dominate others. If you make nice with the humans, maybe you can find Raslin and convince him to join you
Highmen - Find your Paladin and crush all opposition (who says that being good isn't fun?)
Human - As the only nuetral race on the map, you won't find any shortage of powefull, custom made artifacts to help your deal with the 'lesser' races. By the way, there is also a hero named Rastlin that you might want to find.
Dark elf - You have been tactically secluded somewhat so that you can build and conquer (since the AI won't grab any artifacts, I guess you can get some of those too).
Undead - As Dracula, you can get all the help you need by freeing Tiamat, the queen of all evil dragons. She is being held in a Dragon hunter's camp.