Lost my iphone 4, now just bought new one how do i downlaod all previous apps and contacts

i lost my iphone whilst in china, i bought a new iphone 4 from Hong Kong, how do i sync to itunes/apps to retrieve all my data
i have donloaded itunes to another laptop with my same log in details but can not  seeem to download all my contacts etc
before i left the uk i backed my home pc on to my portbale harddrive
can any one please help to sort this out

http://support.apple.com/kb/ht2109

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