Please help - intalling Speakers in peugeot 107

[iKnowNothing]

Hi, i have a 107 and know absolutley nothing about installing speakers into a car, only that i need:
A radio http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_869353_langId_-1_categoryId_165474)

And want:
http://www.halfords.com/webapp/wcs/stores/servlet/...

aswell as
http://www.amazon.co.uk/Beat-BSW8ACT-Amplified-Sub...


Now. i have a few questions, firstly, I've heard i need some sort of wiring kit/rca (?) cables to install these, can anyone help direct me towards some appropriate ones?
Secondly, would i be able to install the sub and the 4" speakers using the same wiring kit to the same radio?
Finally, how do those under seat subs compare with proper Subs?

[iKnowNothing]

bump

[vx220]

I discovered there is a 107 forum, when my wife got hers...

...may he of help?

They might not, they seemed to get amazingly excited about bonnet stripes and glove boxes iirc