[_Tommy]

No need any map editor to set up a simple checkpoint.
Use 'SetPlayerCheckPoint' - https://sampwiki.blast.hk/wiki/SetPlayerCheckpoint
'OnPlayerEnterCheckPoint' - https://sampwiki.blast.hk/wiki/OnPlayerEnterCheckpoint
'SetPlayerPos(playerid, X, Y, Z)' - set the player's pos when he enters a created checkpoint

Good luck.