I'm not sure what you mean, Gitta. If you're trying to promote a business or a book, you may only need a handful of Hubs to be effective.
They need to be quality articles, at least 400 words (but over 1,000 words does better), and they need to be original (i.e. not published anywhere else on the internet). You can include two links to your business or book. Obviously you'd choose subjects relevant to what you're promoting.
It can take a few months for the Hubs to move up the Google rankings so patience is needed as well!