How can quark publishing help with my publishing business?

B - Number of ISBN (International Standard Book Number) includes digits that identify the publisher and identify the book. Can be obtained through the Chambers of the Book or directly in the ISBN (Ministry of Culture - www.mcu.es).The editors casual, one or more works are not lacking in continuity publishing own unique code, but are assigned an ISBN number one use for author/editor. The request is made by mail to their headquarters in Madridd with corrrespondiente printed form (no need to send the book). This request is made by the editor, not the printer. If it's an author-editor, it must attach a photocopy of the DNI. This procedure is completely free.

Access the link at the top right of the page to start the registration process.
Use Google's online tools to select the location you want to run your campaign and create your ad and choose keywords.
Select the daily budget you want to invest and enter your billing information.
His campaign will be activated and thereafter start to gain new customers.

To create a publishing first thing you need is to create a company in accordance with applicable law or make autonomous, that is the requirement more cumbersome and perhaps the biggest drawback.
As to how desktop publishing your own book, I attached information from the website of the Generalitat Valenciana, in the section on General Directorate of Books and Libraries gives the following requirements:

1. Protect your work's authorship through the Intellectual Property Registry.

2. AutoEdit (or create an editor)

- Legal aspects:

A. - High in the IAE (Income Tax) for the activity defined in section 476.1 (book publishing). The processing of this tax is made directly to the tax office. Can be obtained by a manager. If it is a legal person, is necessary articles of incorporation of the company, if it is a natural person, the NIF.
In the case of author-editor also must follow these steps but the rate is reduced.