Step One: Gather everything you will need to make your custom map.
If you are doing something such as an Adventure map, I would suggest you get Spawner GUI and TMI (Too Many Items).
For Survival, I would just get Too Many Items and maybe fly mod.
Step Two: Select your Minecraft World
Now you have to select the world you want to build your map on. To do this, just make a new world or select a pre created world. If you want to do something I STRONGLY suggest and recommend, download this Mapper
Mappers show your Minecraft world to you so that you don't have to wander around.
Step 3: Build Your Minecraft World
You should know how to do this. If not, I just cannot keep myself from laughing.
Here are some suggestions for Minecraft [Adv] custom maps:
101 Ways to Die
and MANY more!
Step 4: Share Your Minecraft World
Now you've built it and worked on it. Time to share it. There are some file sharing websites in which you can use. First, you have to make your Minecraft World File into a Minecraft World .Zip. This is very easy.
Mac: Right click on the folder and select "Compress". Done
Windows: Right click on the file/folder, point to Send To, the click on Compressed folder. Done.
Now go to Mediafire (file sharing website) and put in the storage. Then, put that link on Ad.fly
NOW put the adfly url in the forums. Done. You have successfully made a MineCraft Custom Map.
1 - How many maps can you have at once?
Currently, you can have as many as you want.
2 - Does this work with the Xbox360 Arcade edition?
No, the Xbox360 does not have a Finder or Appdata or any of that, but I think they are thinking something up.
3 - Is there a Windows edition mapper because the mapper in the download only works for Macs.
Yes, look in the Minecraft Wiki there is always a windows one.
4 - I cannot download/install any of the mods you recommended.
This is a map thread. Look in the link box for mod installers.
5 - Is it possible to set the spawn point for your map?
Place a bed and sleep in it, then destroy.
6 - How do you make the downloader have no items in his iventory?
Well, with TMI you can delete the items. If you don't have TMI, you can just throw them in an ocean or a hole.
WILL BE EDITED SOON!