Quite a few. You don't HAVE to, it just adds features once you play the regular game after a while.
I only have a couple of mods, just to make it a little easier to build stuff or get to places as I don't get a lot of time to play. It was probably a year of playing without mods before we decided to experiment.
Use minecraft forge or modloader so that the mods are compatible.
No. I use that mod and I don't have mod loader.
You can either your invedit a mod or you could use an in game mod called too many items
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.
No, you can't. But however, you can run the "Too Many item's" mod at a separate rate, as well as the Client, but not at the same time.
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
You NEED to have downloaded minecraft to use mods. There are hundreds of mod installation tutorials for all of the most popular mods on YouTube!