[ubuntu] how to make a network in Ubuntu?

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http://ubuntuforums.org – Hello. I'm new in Ubuntu. i have desktop and laptop. i have an access to Internet via wifi adapter in my desktop ( http://ubuntuforums.org/showthread.php?t=1404496 ) . my questions are : 1) how can i create a a network between laptop and desktop? Please, write a step-by-step instruction. 2) how can i create a repository at my laptop to update packages from laptop i.e. for example there are some updates for some program at ubuntu repository. i've downloaded them from Internet to my laptop. i don't want to download them from Internet again. i want to download it from my laptop. (HowTos)