FREE FOR ALL!! MUAHHAHAHAHA
Make everybody start in their normal starting places, but with 32 slot bags, teir 6, and season 3 gear (or t7/s4 if you make it). Let them start with all of their spells, and make vendors that sell gems, mounts, shields, weapons, and other strong items for free! Then block up the starting areas with walls, and the only way to get out is a portal to Gurubashi. Block all exits from gurubashi, and put a graveyard right in the middle of the arena. Make sure you let people enter the stadium stands and stuff, but make Stranglethorn a PVP area so even if they leave the actual arena, they are still in pvp! I will try to get a image of what I mean.