its alot of work, depending on what country you want it to come from it changes prices of things and etc. one of my friends was looking at grabbing an r33 skyline, but once he found out how much it would cost to put it into a container, put it thru customs, wait it to be cleared, and etc, he changed his mind.
There is so many things that you have to do the car before it even leaves its native country, it has to be clean of all soil/dirt, it has to be steam sprayed to take off any sort of things that we dont want here, for example bugs. than you have to clear it thru customs with all the proper paperwork from epa, ici, and etc, and btw, it has to be in english. Then it has to meet the emissions standards of the laws and code to the country.
I think that really sums it up in less than a paragraph really, but if your really serious bout getting a vehicle from another country you could always call customs, the EPA, or the DOT, they would have some of the information that would make thing a lil bit easier.
And on a side note, why are you looking at getting a car from another country? what kind of car?