Search on Google images or use the above links for your first car.
Open Microsoft Publisher, select new document, postcard choose index cards. Start by putting the name of the car show across the top of the index card in Wordart.
Now include the following details for your car in a textbox:
Car Make
Car Model
Car Colour (simple colours ie blue, green, red etc.)
Car Picture
Once you have finished your first index card use the duplicate feature to create another. Amend this second index card with the details of a new car but keep the layout the same.
Repeat this process to make all the cars for the show. You will need at least 6 but you may have time to create more than this.