You must have the Sims 2 Nightlife expansion pack installed. Then it will be in the buy catalogue under "beds".
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You can purchase a coffin in Sims, located under the 'beds' category. The vampires on Sims will burn up in the sun if you do not purchase them a coffin.
No
Make sure you have at least 2 sims in a lot and when you see a vampire, make both sims friends with it and choose the one who won't be a vampire and click on the vampire with influence to... bite neck then the vampire will bite their neck and they'll become a vampire! Need COFFIN be in by 7am - 7pm or you'll burn in the sun!
Quite simple really. All you have to do is buy a coffin from buy mode and make sure its not exposed to daylight. And then just do what you would do with a normal sim! :)
No, you cannot have Sims 2 pets on Sims 3. You must have Sims 3 pets for Sims 3 or Sims 2 pets for Sims 2.