noobie who knows nothing yet!!!!

[chilledphill]

hi to all help and advice needed
i found this forum by looking so not compleatly stoopid ! and it looked like the best one for me to ask some questions i hope i have not posted in the wrong place. so here goes

what i would like/1. to be able to watch as much sport as poss
2. to inc prem football. international football.
rugby. cricket.golf.and much more if i can

current setup/ 1. 90cm dish
2. humax va fox.mpeg2 digital.viaccess with card slot
3. art card ( out of date )
4. slrf modulator
5. associated cableing

what i think i know/ 1. art not much use to me
2. have been told i need nova card

what i would like to know/ 1, will i need to get all new setup to get nova
2. if so what equipment do i need to buy
3. best place to buy from .
hope some one may be able to help me many thanks.