I introduced my kitten to the 5 year old cat we have gradually. we got her at 8days old and started the introduction with lying things of hers around the house for him to hate.
we slowly initiated more contact for longer periods until she was big enough to run. then we left her on her own with him. he exercises restraint and shes a bitch. when he gets really agitated with her, he lets her know and she ignores him.
(Lee loo is the kitteh, Mojo is the 5 year old cat)
this is them playing
YouTube - Lee Loo's Jabs
YouTube - Lee Loo and Goliath (mojo)
YouTube - Mojo fed up with playing