All of the Kardashians have dark hair so you're already on your way there! I guess if you wanted to you could ask your hairdresser to put a brown gloss over it to give it a chocolate-y shine. I would apply a serum or a spray such as John Frieda - I know they specifically do non-frizzy products, all my friends who've used them said that it's excellent. The Kardashians tend to centrepart their hair. You'll need a pair of hair straighteners, and obviously preferably GHDs. Section your hair after drying and always use heat protection spray. Gradually do your whole head. I always do the bottom layer first and work my way up. Finish with a light spray of hairspray, Elnett by Loreal tends to be quite good! This will hopefully help you keep the style and give it the Kardashian shine! Good luck!