Apart from the consular fees established for this purpose, you will need a well-justified business plan which should include aspects such as what would be the differentiating element of your business and to what extent you are going to contribute to the Spanish public coffers.
This will take into account aspects such as the surface area of the business premises and a real forecast of hiring employees in the medium term.
It is a procedure subject to certain discretionalities of the Consular Administration, so all the requirements established by the Law must be met, as well as other evidentiary elements that complement the project to be undertaken and that add differentiating aspects that make the application successful.