I'm running a small Minecraft LAN party and trying to find out how to make the server auto spawn into the nether and skip the over world. We're running a PVP contest in the nether and want to spawn players directly there.
Your best bet is to setup the overworld spawn point so that as soon as a player spawns there they get sent to the Nether. I'm not sure if it is possible via commands to teleport a player to another dimension. If not, then what about placing portal blocks throughout the entire spawn area and surrounding it with an obsidian wall or something?