I would recommend that you go to a reputable professional hairdressing salon to get advice on an iron. There are several great salon brand irons which one can purchase ONLY from a salon.
Be sure to iron your hair with a heat protector spray. Shampoo and condition your ethnic hair weekly using Dark and Lovely 3 in 1 Shampoo and Deep Conditioner. Be sure to treat your hair once a month using Dark and Lovely Anti Breakage Healing Treatment to reinforce and strengthen your hair.