There are lots of similar threads on the forum - take a look and post any specific problems you have.
http://www.linuxquestions.org/questions/search.php
Simply:
First get your computers to communicate - assign IP addresses and set gateways
If you want to share files then look into samba.
Like I say - post more specific problems and people can help easier - nobody is likely to sit down and write a complete networking guide - there are plenty of resources available to you. Try them first
