Display color on a TFT disply by using mega2560

Hi , everyone...

I am new for using arduino and microcontroller as well ...

recently, I bought a 3.5" 320x240 display and arduino mega 2560(because i think this this the powerful one)...

If I would like to display colors on the display...how can i start my project??

The color that I want to show is different for each pixel...

but each colunm of the pixel should have the same color .

I have the display data sheet which provide the pin assigamnet..

can anyone can give me some advise on this ??