how to build a small netwok for my lab

I need to design a small office network with 8 computers, all the computers need to link to a network printer and fax. I should use peer-to-peer or client-server network?? And why??

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I don’t how to start, please guide me and explain in details, like what topology should I use, what internet or network devices required, the vulnerabilities and security measures in your network and Internet, etc.

Thanks.