I ordered
3M 1080 G12 GLOSS BLACK 5ft x 8ft (40 Sq/ft) Car Wrap Vinyl Film from amazon. You need the 8ft length to do the long piece of window trim on the Model S. Not sure what the measurement is for other models.
Patience and a hair dryer or heat gun goes a long way. This material is pretty decent to work with and this roll should give you more than enough to make a few mistakes along the way. Just do the longest piece first since if you cut the roll wrong you may not have the length leftover later.
Also wait for warmer weather....makes it much easier to work with. And you don't want to get it wet for a few days after also.