Can someone help me set up an invoice

I have a customer made I have services and products made but when I go to make the invoice it says $0 of $0 I went down and added the service it says whatever the price next to it but it won’t update the $0 of $0 I don’t know what I’m doing wrong I was going to pay for Dollar bar academy but I can’t find that either the websites down

Pl post a screen shot for more clarity