i am working on a project:auto parts web store With installation and I do not know where and how to start؟
help me

I suggest you start by reading a book on vb.net and a book on SQL. When you have specific questions feel free to ask.

i want know i need What tables with what Columns ?

How is anyone possibly going to tell you which tables you need and which fields will be in each table based on your description of..

auto parts web store With installation

Even before you start the technical development of this regarding your application and data store, you have to first figure out the business processes. What information needs to be collected? How will the data be related? This will help you build relationships. Here are some hints on what to think about...

customers, parts, suppliers, sales, inventories, etc...