Drivers For Dell n5520

Hi

I have Dell n5520 Core i5 laptop and I am using Windows 8 Operating System.

I have all the necessary drivers for Windows but i don't have Drivers for Linux (Ubuntu 12.10)

When i open Linux, fan speeds up and makes noise. So

Where can i get Drivers for my          

1.Graphic Card

2.HD 4000 Driver

3. TouchPad and other Drivers etc..

Thankyou, for your Time

Have a Good life, Cheers