Download it of the INTERNET and then put it on minecraft
You can't unless you have a mod.
Depends on the mod. Either you mod folder in Run>%appdata%>.minecraft or they have to be installed into the minecrat.jar file itself. Check the mod details of whatever mod you're downloading.
You can't. That is only on Minecraft Animations. But there is a Pig Companion mod where you can tame a pig and put a helmet on it.
you can have many mod but say if you have the mc donalds mod installed then you try jammy furniture with it it will crash and minecraft will force close
There is a timber mod for multiplayer that the owner has to put on, so yes it does work if you're the owner.
Sorry, you can't, unless you make use of a mod.
Which mod?!?!?! It all depends on the mod. Lots of mods are different to install. The easiest mod to instal is the Technic pack. Just install, then run. Easy. just go to technicpack.com
Did you delete "META-INF"? That acts like a sort of "Anti-Hacking Device". Also, When you download a mod, MOST of them need ModLoader. Put the Modloader file in the Minecraft.Jar file THEN put in your mod. Remember to delete Meta-Inf!
It's easier to use something like a mod installer like MCPatcher and others to install them for you as some major updates from Minecraft change where you put them and some mods need special instructions some times.The mod you downloaded should have instructions on where to put them.Be aware, every time Minecraft updates itself the mod your using will probably not work any more and you can wait from days to weeks for the mod to be updated depending on the complexity's of the mod.
You put it in your hot bar and chose it and the place it lol
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.