playing Planetside again and downloading the Core Combat

[kanon14]

Hi i've played the PLanetSide when it was first released last year for a few months, but then i quitted due to heavy school work. now with thh release of BFR i'm thinking of returning. however i have a few questions that i couldn't find answer anywhere

1) do I need to buy a new copy of PlanetSide in order to play because my older account has expired. I tried using my old CD-key to install but was unsuccessful.

2) Sony Station sites advertises that if I purchase and download the digital copy of Core Combat I can get the BFR stuff too, so does that mean I don't have to purchase a seperate copy of the AfterSchok expansion?

3) Is AfterShock nothing more than a combination of PlanetSide and Core Combat?

Thx