Спасибо очень

In "Потому, что нету денег ни рубля ни рубля", why is there an у on the end of нет and why is it ни рубля and not не рубля? Is that the genitive case?

Also I don't understand most of the endings in "И среди моих друзей людей приличных нет", specifically "моих друзей людей приличных". Which case (or other grammar thing) is affecting those words?