could be a stupid question, but are mods only available for pc users? and if there are mods for ps3, how do create one(them)? take care and thanks.

Yes, mods are only for the PC

What SteveDog said is accurate, any further discussion about it would not be advised. If you have a pc that can handle Fallout 3 then mod to your heart's content, otherwise it's best to leave it be.