Every mod is different, so you need to look up the specific mod and read about how to use it's particular feature that it adds to the game
Use minecraft forge or modloader so that the mods are compatible.
No. I use that mod and I don't have mod loader.
you download the mod/cheat you want then you look for a mod spotlight on youtube to see how to use it
You could build it or use Tale of Kingdoms or Castle Defenders mod
there are no sharks in minecraft, you use the mo's creatures mod. I dont use this mod so I dont really know, I thinks it lives in icy water
I am unsure if a mod like this exists, but if it does then yes, you will need to use this mod.
yes there is.
Sorry, but if you are talking about Minecraft Pocket Edition than you can use mods.
a mod where you can fly a plane on minecraft so get it
Nope. You HAVE to download a minecraft mod to have it.
Minecraft doesn't have an official best mod.
One example of a superhero mod in Minecraft is Superheros Unlimited for version 1.6.4.