Want to build my credit up to financial a car in a yr or 2. Should i get a credit card?

Question by : Want to build my credit up to financial a car in a yr or 2. Should i get a credit card?
Right now I'm a college student with little credit. I have 6,000 saved up for a down payment on a Lexus. I want to finance it out but don't want high interest rates. I have a little credit from a loan I got through my bank to help pay for school and my mom co signed for me. Would it be smart to get a credit card and get small stuff like gas etc. I plan on getting the car Sept 2012 - Jan 2013

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