Advice for home network

Not exactly sure where else to post this:

Well, my brother moved back home, and loves to use our cable modem. I convinced the parents to install a home network(wired, through the walls) we need only buy cable, wall jacks, and the wire crimmper/cutter/stripper. Being the only one physically able to crawl around the attic AND with the knowledge of electronics, the job is up to me. My question is: Would anyone like to give me some advice so I might avoid any catastrophees?
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