My First Car Show, Need some help!

[AM.MSCL]

Since this is you 1st car show to put on I really suggest make things simple.

Cub Scout Troop Best of Show award - Only the members of the Troop get to vote on all the cars and present an award.
Viewers Best of Show Award - Anyone that comes to see the show can vote for the best car and present an award.

Get the Troop involved with getting sponsors; take the troop members to different local businesses.
You be amazed at what even restaurants will donate for gift cards; different types of businesses will be willing to donate lots of things for silent auctions.
At the same time ask these businesses if you can put a poster or flyer on their front door to help promote the show. This shows the public that the business is helping support the troop.

Hand out flyers promoting your show at other shows, even better is have the troop go to the other shows and hand out the flyers.

Good Luck.