well first you have to buy nightlife then go to construction mode and there will an icon with a driveway and roof over it.
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First in build mode you need to buy a driveway. Once youe bought a driveway and placed it on your lot you can go in buy mode in miscellaneous and cars and buy which eer one you want and place them on the driveway. You need Sims Nightlife
You download the mod sims 2.
Its impossible, you cant.
In order to buy a car in Free Play mode in the Sims "Bustin' Out", you must first enter build mode and build a driveway, then buy it under buy mode.
I'm not sure if you can buy them but you can grow them in your garden if you have sims 2 seasons.