it depends on the mod. In most cases, you should add the class files to the minecraft.jar folder. Try reading the instructions that came with the mod.
Unplug your hard drive and put it in your computer and get mods for minecraft
No your have to wait for the mods to update which may take some time.
No
you can get minecraft mods and textures off the minecraft mods website.
Search Yahoo/Google/Bing for "Minecraft Mods". Read the instructions on what and how to install them and see if they are compatible with the other mods your going to put in.
Not without mods (modifications). Mods are extra files that you put into your minecraft.jar folder, which can change the game completely.
bearshare is not required to get minecraft mods.
Yes, most Minecraft Mods are updatable.
there are no mods in minecraft pe i hope there will be
It requires mods. It is not possible in Vanilla.
No it might be that you have an out dated mod that crashes to game or that you do not have something like modloader (which you need for most mods). Also when downloading mods make sure they are for your current version of minecraft or it will defiantly crash.
you can get most minecraft mods off the minecraft mods website, or you can google.