Yess
Downloads are sold they are not free and the Playstation Downloads that are free from the Playstation Plus are not free they require membership in Playstation Plus and expire if your Playstation Plus membership expires.
Free items for Playstation Plus customers are only for members and you only have there use with a valid membership in Playstation Plus. Items purchased with the Playstation Plus discount remain available if membership expires including the ability to download them again if needed
Yes, it is possible to purchase, or 'stack', additional time to your Plus membership
not really first you open the account. then you put money into the account with either a card card or Playstation network cardsee related linkHow do I create a new PlayStation®Network Master account?
There is no charge for a Playstation Network account except the optional PlayStation Plus Account for the Playstation Store free games, discounts, and other bonuses
No, you will not need to purchase a PlayStation Plus membership to play online with the PS Vita.
No only the Playstation Plus account and Playstation Store purchases have charges and the third party services like netflix
They are free and can not be sold or transferred Playstation Plus costs $18 for 3 months and $50 for a year
You can cancel your PlayStation Plus subscription by going into 'Account Management' under 'PlayStation Network'. While in 'Account Management', go down to 'Transaction Management', go to 'Services List' and select 'PlayStation Plus', from here you can select, "Cancel Automatic Renewal' or 'Restart Automatic Renewal'.
Ones ones that were purchased even at a large discount
PS3 does not require a renewal except Playstation Plus Membership which must be purchased
No. There's no monthly fee for regular PSN usage, however there is a PlayStation Plus membership which has a subscription fee.