i am runing a computer business and i want the ten computer to be runing network
how can i do that?

That's a very vague question. Difficult to answer in a single post.

To start, you need to consider the physical and logical network. Physical being network device(s) like a switch, firewall, cabling, network interface cards. Logical like Domain services/workgroup, DNS name resolution, IP scheme. User authentication, etc...

You must use an server and a networking wire to establish network. You can get help from your nearest networking engineer or from the internet consultant.

Your run a computer business and you can't set up a network?

Obviously, But If anyone wants to establish a mini network(More than 1 computer attached with one another computer) it must to beaware by that this is called network.