I usually stick to capturing/defending workshops. It's the most important thing you can do in wintergrasp, on offense or defense, and the more characters you have the faster the job gets done (and there's usually only a couple people to kill depending on which workshop it is). This makes sure the 3 towers are either being attacked or defended by other people, and of course every wintergrasp noob is going to be between the keep and one of the northern workshops, or inside the keep. You don't need to hang out with all of them

I should probably start piloting vehicles but I let other people bother with that