Unless you have an expansion pack installed you will need the base game disk in order to play. If you do have an expansion pack any of the disks can be used to play.
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You can't, you need the disk to install the game.
if you have The Sims 2 and The sims 2 pets, install the sims 2 first and yes you need all four discs and the game case with the code. Then you can install the sims 2 pets and you will also need the manual for the Sims 2 pets or the game case for the code to install the game.
the whole point of the second disk is to hold more memory... unless you find some sort of download its impossible... sorry.
It depends on what Sims you own. Some of them you must have the disk inserted, and others once you install them you don't.
Yes, you can. EyeToy is not needed at all to play it.