News website, multiple layout, category base?

i have a theme, i am html web designer, but i can understand some php / wordpress coding also

i have a wordpress theme & i want to convert it into a news portal

please guide me, i want to convert it into category base, should be like that

http://www.firstpost.com/ please guide me, how can i do ?

is it archive page or separate category page ?

—

http://www.firstpost.com/category/world

when browsing category page, you can see there are different post layouts

without any duplicate post

please guide me