Im trying to build my credit so I can lease a car. What should I do to build it quickly?

Question by Colin R: Im trying to build my credit so I can lease a car. What should I do to build it quickly?
Im 18. I want to lease a new vehicle soon. Within six months. I have been trying to build my credit ever since I was 18. I only have one credit card and it has never been late always paid on time and usually has no balance. I checked my credit report and score and I have a score of 681. I realize that its not all about the score. I'm trying to get some more accounts on my report but

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