Making a simple webshop with SQL and C+

Hey guys

For my school I am making an assignment where I have to create a webshop, a very simple one. In SQL I have created two tables, one with the different categories, and one with all the goods the store sells.
Now I need to make a C# program that can delete, add, and edit the goods, that only communicates to Console. And then I have to make a program or method that can calculate the total of the goods that the costumer might want, also in C#.

I am stuck , only got to the SQL part. I am new to this. Can anyone maybe help me or point me in a direction?

Thank you so much§

For the C# part. you might get better answers on a C# forum.
People here are mostly into SQL server.