[blu-ray]

Hi-!
I have got buy orginal GT4 PAL
There are 2 dvds
1) Game
2) Movie
I know my question is silly but...
Question is :
How to buy new cars and some thing like that ?
I have win all School mode
And i have got 5-Medals

But How to buy new cars ?
How to change oils ?
How to buy new motors ?

Help me - !