Need basic help: How to upload my own map?

[xoft]

If for some reason /setspawn doesn't work, you can always edit the player data file - in the "players" folder there's a bunch of subfolders and in each a bunch of .json files, each corresponding to one player (based on their UUID); open them in notepad and change the SpawnX, SpawnY, SpawnZ coords in there. There's also a "lastknownname" somewhere in that file, specifying the player name, to help you locate the correct file.