|Thank you guys for responding.|
I will take Curt R's suggestion. Curt, you got the point, the software probably has the capability built into it and to facilitate the designation of one PC as the admin unit. You are right I need a switch and a 16 port router. I am in planning stage and I will try your suggestion.
As a start-up, I don't have the budget to hire an IT contractor. I prefer to make the task simple. Besides, the contractor is going to charge me a bomb plus recurring retainer fee.
I can get a software to filter out restricted contents if necessary.
I appreciate both the responses from Curt R and Ace Omega.
Thank you very much, Flozzy.