Hope this helps
Ebay in my opinion the best place to find them. Tapeworks.com sells complete kits although pretty pricey. Also you can find a local vinyl decal shop and they'll make you pretty much anything you want.
1. Remove all dirt, bugs, etc. Just about any cleaner will work here. If you use anything ammonia based, be sure you remove ALL traces of it before you continue.
2. Spray the surface with a touch of dish washing soap added to plain water. Be sure the area you will be sticking the decal to is mostly wet.
3. Remove decal piece from the paper. Use a razor to lift the decal off the paper instead of using a fingernail. Pull it off slowly, being careful not to tear it.
4. Apply the decal to the wet surface. You should be able to slide it into position while it is still wet.
5. Push out any bubbles with your finger. If you start to form any wrinkles, lift an end of the decal piece up and push the wrinkle out.
6. Use a blow dryer on your decals. This will allow it to stretch and conform to most curves. As you blow heat on it, push out any wrinkled edges or bubbles.
7. Now repeat from step 3 until every decal has been applied.
8. Note, if any bubbles are left, poke with a small needle while still wet.
Allow for plenty of dry time. Let it sit in the hot sun or use a blow dryer to speed up the process.