Ace sticker . You might already have done it but if you needs turning into an .eps or whatever for plotting, I can do it for you . If I ever get round to lowering my K12, I'll have to design a K12 one...
As soon as Dorris is low, i will be making like maybe 5 or 10 stickers with a little editing, probably be kind and say you can have it for free but pay for postage
Depending on the size & how you print it or get it plotted on a machine die-cut style (i think that is the correct term, you might need to clean it up a little) A clean & simple design will make it easier for the plotter to cut & less chance of tearing it during lifting & application.
What have you designed it in?
Oh like Guy said you will need it in an EPS or AI format
If you have a plotter then sorry for teaching you to suck eggs