No, you don't.
No, u don't need 2
You need to have installed the sims 2, the sims 2 deluxe, or the sims 2 double deluxe, but not all of them. You just need to have the regular sims 2 installed to install and play it.
No, because the sims 2 is a separate game to the sims 1, not an expansion pack. So buy, its great :-)
Yes because business is an expansion pack which means you download it to the sims 2
Yes, you need Sims 2, Sims 2 Deluxe or Sims 2 Double Deluxe. (execpt they dont make just plain ol' Sims 2 anymore)
No, you need the disc to play it.
Yeah, you do, because Sims 2 Pets is an Expansion pack, which means it adds on to The Sims 2.
you cant download the sims 2 celebration stuff with out the sims 2
You need to download them from places like Mod the Sims.
Yes. If you want your sims to be able to produce triplets, you will need to download a mod.
no it can run on its own
You need to buy the sims 2. After when you put the disc in your computer double click on it. From there the disc will have instructions. To buy sims 2 it is about $35 to about $40 depending on where you but it. Then you have to load sims 2 night life back onto your computer after you download sims 2.