we want to come in Spain for doing business, we...

You have to apply for a job  Spain that matches your academic qualification and that is consistent with your scientific and practical experience first.

Then, get a contract in this country. After that, go to the embassy  Spain to obtain a work visa  Spain with the following documents

Valid passport for at least six months

Job contract

A certificate of good conduct

Bank Statement

Booking airline tickets

Paying the visa fees
visa spain work