how do they judge the size of skateboards?
When selecting a deck you should consider the material and the size. Material: Most skateboard decks are made of 7 ply maple wood. Blind and Darkstar have 9 ply skateboards. These are going to be stronger, thicker and heavier. Element makes a Fiberli...
how do i get into doing art for skateboard decks, for skateboard companies?
Get in good with a Pro Skater, they are the ones who pick out the art for their decks.
where can i buy spray paint?
you can get paint at any general store such as wal-mart or your local hardware store. You may run into an age issue, and if so, then you are going to have to have somebody buy it for you.