Yes, you download it then plop it in you saves folder
Custom maps in minecraft can usually be downloaded for free.
Yes, it is only a custom map. All custom maps are free, and you should never have to pay to play one.
You can't read rules for custom maps. They will be at the start or on the forum page.
SkyBlock is a great map.
It depends on the map.
They cost memory. No money though.
Yes minecraft adventure maps are downloadable for the general public for free
Unfortunately, no, you cant. Only on a PC or a Mac
There are most likely many. One of them is the lost custom map.
You use any kind of editor, like MC edit, and you just load
Dead Lox user name on Minecraft is Deadlock. Deadlock adventure maps can be downloaded from the free down load Minecraft website. The site also has links to other adventure maps for Minecraft.
You can download them now from places. It's just a lengthy set up though.