How can a person develop more self-discipline?

Set Goals: Sit down with paper and pencil and write down goals. Start with where you want to be in ten years and then go backwards. Like-"if this is where i want to be in ten years, where do I need to be in five years? And so forth. Then, try and have monthly weekly and daily goals. Tell yourself: "he who hesitates is lost" & "there's no time like the present" you can do it. Stay positive and focused.