Minecraft Forge lists you all mods in minecraft and Forge
Get all the mods!
All mods are 'legal'.
You have nothing to worry about when downloading mods from Planet Minecraft, it is safe.
you can get minecraft mods and textures off the minecraft mods website.
There are many sites that just have a list of them for download.
All minecraft mods are free. If you find mods that cost money, don't buy them. It is either a scam, waist of money, or both.
To get mod packs you must go to the forums for minecraft. There should be a forum that is for mods and you can find all the mods there. The first mod that you will need for minecraft would be the ModLoader, which is used to load all the mods that you will acquire.
No
You can't get mods on the Xbox 360 because it can't download mods at all.
You don't need a CD for mods. You don't need a CD for Minecraft at all.
Yes, most Minecraft Mods are updatable.