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Determine your racing division. Purchase the kit. Download the plans. Build it!
The AASBD (All-American Soap Box Derby) organization has specific requirements and limitations that you and your gravity racer will need to meet. The divisions are:  The Stock Division, designed for participants aged 7 to 13. The combined weight of car and driver may not exceed 200 pounds. The Super Stock Division is open to participants between the ages of 10 and 17, and the combined weight of car and driver not to exceed 240 pounds. The Masters Division is open to participants between the ages of 10 and 17. Car and driver may not exceed 255 pounds. All competition kits must be purchased through the AASBD. They are available online at here. They are available at http://www.aasbd.net/cgi-bin/commerce.cgi?search=action&category=0013.