Either go into the single player menu in minecraft and select which one you want or add the map/world into your "saves" folder.
If you want to add maps to your Multiplayer then just put the map into the folder your server app is in then add the name of the map into the "server.properties" folder for the game to see it.
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This all depends on your maps. A copy of Minecraft that has no started maps is around 228KB. But after you start playing this will go up.
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.
I cannot speak about all the maps, because I have not downloaded them all but you can't tell if it does if your only criteria is "a minecraft map." however, actual, normal minecraft maps do not contain any viruses. If you want, you can scan it for viruses with some software
Adventure maps are usually used in minecraft maps it allows you to not break certain blocks but you can use a certain item to break that block.
You cannot in alpha