I just can't quite wrap my head around how would you express the existent of something is for a specific purpose. Like, if I want to say "I have an account for Skype" do I say "Skypeのためにアカウントはある" which in my mind just sound like "I have an account for the sake of 'using' Skype"? On that same line of thought, says, I want to tell my friend to get an account for Skype, do I just say "Skypeのために君のアカウントを生み出す". If you guys can give me some explanations and examples on the whole "express the existent of something is for a specific purpose" or "something for something" (specially on various ways to express them) that'd help me out a a lot.
And please excuse me if my Japanese examples are bad/broken, that's all I could muster with my current knowledge. Thanks in advance.