Add plugin for stock management and orders

Hey, I have one site and its been one year and its running well. It’s an ecommerce site. now, the situation comes when client asks me to make a module where he can see the how many orders customers have ordered. what product was ordered? which products are in stock and which products are remains?

Now, my question is what should I do? should I make a custom page or use any plugin? Please guide me if there is plugin than tell me.

Thanks in advance