Count visitor

I'm a junior programming for my company. I want to know how to implement Web-ecommerce. Right now, I finished installing payment plugin on my site. My main task is to count the visitor how many they visit on my site. I use Nopcommerce w/o source code and run on the server which has not Visual Studio. Do you suggest me whether find someone's plug-in and install it or implement code by myself and how to do.

P.S. Count unique IP (Not open browser and count)
     Totally count from this week and since the site opened

Do you have access to your sql server? Can you run sql queries?

Do you have access to your sql server? Can you run sql queries?

Yes, I have SQL server

I run on SQL server. I also use trigger to access through my company's database

Or maybe google analytics?

I don't know how to configure the google analysis. I read and did the steps the NOPcommerce that guides me. But Im still confuse it. The guide provides the short description. I dont know it works or not. Could you help me how to configure it step by step plzz.

Have you signed up for a google analytics account?

Yes I registered it already

Login to your shop admin, go to Configuration > Widgets, for the Google Analytics widget click the configure link, add your google analytics code to the ID field, click save. Now in the widgets list, click the Edit button for the Google Analytics widget, tick the Is active checkbox, click the update button.