To get the best look for your hair you need to begin with the best shampoo and conditioner. For ethnic hair a type that means products of natural ingredients that will help to reduce the natural frizz of your hair.
If you want to have beautiful curls you should blot your hair dry with a towel. Try not to rub your hair as you dry it as that will cause more frizzing. Also, don't shampoo everydays as you are removing the natural oils in your scalp that help maintain your hairs health?
For beautiful, curly hair it needs moisture. Apply moisturizer while your hair is damp. You can reapply moisturizer on dry hair to help define the curls and remove frizz.
Always use low heat when using a blow dryer. A diffuser is helpful to have frizz-free, defined curls. If you blow dry with your head upside down you will achieve more volume and lift to your hair.
When allowing your hair to dry naturally try not to run your fingers through your hair. This causes your curls to separate and frizz. Also avoid combing and brushing your dry hair as that will cause frizzing and remove the curls.
Other ways to avoid frizzes is to use a firm holding hairspray and to sleep in a silk head wrap.
For a straight, sleek look blow dry your hair beginning at the scalp. Begin with small sections keeping your hair pulled taught with a brush. When the hair at your scalp is dry you can then move to the other areas of your hair pulling smooth as you dry. Go slow; making sure that the hair is completely dry before proceeding to the ends.