How to make my Minecraft world downloadable?

Typically, go into your %appdata% folder, which contains your.minecraft folder. Navigate to saves and the world should either be "new world" if you didn't name it, or whatever name you put it as. Compress it into a zip(many programs out there do this, such as 7zip, or winrar). You can simple right click and look for "compress into zip file". Then just send it via skype, or google drive, etc.