Now that you've taken a look at the zone, it's time to understand how to play the game. The battle for Lake Wintergrasp is one of the most fun parts of the game today -- it's certainly my favorite thing, such that I sometimes only log in whenever I know there's a battle. The great thing about Wintergrasp is that there are numerous battles throughout the day. It's the game's best mini-game, and I'm looking forward to seeing it get even more awesome as more and more players reach Level 80 and Blizzard makes improvements to the zone.
An hour before each battle, an NPC in Dalaran -- Arcanist Braedin for the Alliance and Magister Surdiel for the Horde -- will yell that a battle will soon begin. He will repeat this battle cry again at thirty, fifteen, ten, and five minutes in order to alert the inhabitants of Dalaran to hopefully drive players into going to the zone. To make it easy, portals to Wintergrasp appear at the Silver Enclave and Sunreaver's Sanctuary.
Generally, a portal to Wintergrasp appears in Dalaran for the controlling faction and observably disappears about an hour before battles begin. This usually means that defenders must make their way through flying mounts into the zone before the battle begins or wait until the game ensues whereupon their faction's respective Wintergrasp Battle-Mages will open a portal to allow reinforcements. Defenders will port directly in front of Wintergrap Keep, where the Titan Relic is housed, while players on offense will port into their respective landing camps -- the Horde on the West side, and the Alliance on the East.