The map can be a mod, but default is just a map download
No, it's not legal to sell Minecraft maps/mods.
you can get minecraft mods and textures off the minecraft mods website.
you can get mods off websites like minecaft mods that no one uploads viruses to because they would get caught and banned in seconds, i reccomed minecraft mods.
Some might, but an adventure map is a MAP, not a mod. Just search for "adventure map" on Google or the Minecraft Forum.
bearshare is not required to get minecraft mods.
there are no mods in minecraft pe i hope there will be
Yes, most Minecraft Mods are updatable.
you can get most minecraft mods off the minecraft mods website, or you can google.
Unplug your hard drive and put it in your computer and get mods for minecraft
to be honest depends on what you think i sometimes have like 10 mods running
On Minecraft Forums
you can easily get mods from planetminecraft