I think of the best way is you can come to China because you know for every one learning a new language the best way is living in the environment for can hear and speak the language every time. If you can't you can try to find a Mandarin Chinese speaker friend and talk with him face to face, if can't too maybe can find a one try to talk on skype maybe not a bad idea too, but you must keep do it everyday, and anyway I think of whatever you learn a thing you must have a reason can let's you have enough power to keeping it,so find a good reason to yourself for learning Chinese, and make a plan for learn it,then step by step to do it, good luck to you!