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First draw it on paper and make a vote, if more then 80 people like it and about 40 to 50 people want to buy it then start looking for fabrication shops like Raceonusa.
Before clay or even 3D, learn to draw.... Pencil, Paper and Perspective are your friends but the greatest challenge.
If you are really interested in drawing vehicles and other transport design stuff, look at stuff by Scott Robertson, Harald Belker, Feng Zhu. They are all top tier concept designers.
And if you do design something cool, send it my way and I'll model it in 3D.
emo dont make fun of that situation but i am going to put up the pic i drew it ugly as hell
goto photoshopchop.com and describe to one of the members there what you are looking for and see if they can render something for you, they are amazing as PS