NEW YORK (Reuters) - Oprah Winfrey admitted on Monday that she had made mistakes while creating her cable channel but promised the fledging OWN television network would still succeed with a new strategy. The talk show host, who recently laid off 30 staffers at the 15-month-old network after poor ratings, told “CBS This Morning” that she had been ill-prepared for the venture. “The idea of creating a network was something that I’d wanted to do, had I’d known that it was this difficult, I might have done something else,” she told the morning program co-hosted by her longtime close friend Gayle King.