yes, you can make as many accounts as you like
No, you cannot link different consoles' account systems with the PlayStation Network.
yes
Playstation 2 pads need to be plugged in and they have a different socket to the ps3 anyway sorry
No you can't because the Wii console won't recognize the disc because it's a different game system. But you can use a PlayStation disc on a PlayStation 2 or PlayStation 3.
Basically yes, all you need is hard drive space and psn account. You must have an online connection for your PS3 to use the Playstation Home and I believe you can have a PSN account without one active on your PS3.
The PlayStation Vita is a standalone system. You do not require a PlayStation 3 to use it.
Yes make sure you transfer everything on to a memory chip. Ps if u want the the games that, that person bought on the playstation store just use their account on the other playstation and you can download it free via the online playstation store.
No he has an Xbox 360 and a playstation 4 but no acount.
yes if you create a new user and use your e-mail
Yes. PlayStation Network allows you to save your billing info (ie. a credit card) to your account, allowing you to buy games on the PlayStation Store on the PlayStation 3 and PlayStation Vita without the need for a prepaid card.
Yes. Frantic_won
no