Windows How to make arena ?

[pioncz]

Hello,
I dont know how to make arena ; P i have pvp zone but...
I want to make switch to teleport ppl to arena. I have something like this :

function onUse(cid, item, fromPosition, itemEx, toPosition)
doPlayerSendTextMessage(cid,21,"FIGHT !")
doPlayerSetTown(cid, (3))
if(isPlayer(cid))then
getCreaturePosition(cid,{x=40,y=270,z=8})
end
end

It should Show textmessage teleport player and change resp place.
I dont know why it dont work and what i must do next to change again town id. :<