a few questions

Hello,
I have a few questions:
1) In what language must I write the code?
2) Can I plug more than I shield on a card?
3) Can the wifi shield send video stream with wlan?
4) Must I buy a lcd screen?
5) Can i control servos and motors with the card?
It is to build a wlan controlled video car.
thanks.

1) any language you are able to make work on this target (some may have
cross compile issues)
4) the system can run without a LCD
5) with a few external components: yes