You can't delete playstation network from a psp.
Yes all you need is a psp
you sign up and it's free on a psp
yes
Yes it is
No Live is a Xbox network the Playstation products use PSN or Playstation Network
The Playstation Network does not charge a fee
you have to get a PlayStation network card and then go to the PlayStation marketplace
Full PSP games can be downloaded from the PlayStation Network store. The PlayStation Network store is accessible via one's PSP where full PSP games are available for purchase and download.
You can download games for the PSP on the Playstation Network, provided you have a PSN account.
'The latest', always.
PlayStation Network.