I have seen some really cool side plates. What are the minimum requirements for my side plate? Do the numbers have to be a certain size and colors? I was thinking a black plate with red numbers to match my VTT. Or at least the same plate but with white numbers.

Thanks for any advice.

http://napka.org/pdfs/NAPKA%20Guide.pdf:
Article 5 - IDENTIFICATION NUMBERS
The Identification number of the pilot must be placed on both sides (of the sides) of the buggy and an additional placard may be put in the centre of the rear of the buggy. The identification numbers must be: at least 5.5 inches high and 2 inches in width, using a .75 inch letter stripe width, using font Helvetica. The lettering must be black set on a white background, preceded by the identification letter of the country of the pilot. For Example a US pilot with the number 15, would read US15, Canada KC15 and Mexico MX15. For those pilots using kite skates, dirt surfers or ATB/Land boards you must visibly display your number on your chest and back on some type of garment possibly like a vest, (the high visibility green or orange vests are readily available at most home centers or safety equipment stores) The number size requirements are the same as with the buggies.

Having said that, there are some pretty cool panels being sported that might not meet the above, but this is a family sport and it's all about fun. It might simply boil down to how much time or talent you have.

Thank you haiguy!

If it was a snake it would have bit me..

no problem.
i'm one of the plain-jane, no talent, plate guys.
check with BEC or flyguy0101 for some wonderfully artistic/talented plates.

Just a side note to the reference above. If your plates don't adhere to the rather strict guidelines, don't fret. The only real requirement is that your number is legible from a reasonable distance. Artistry is never discouraged. T-minus 14 days till arrival and counting