When you are about to hire a search engine optimization company, it is important that you research into the company and all of the different tactics the company uses. You should always ask questions. Some good questions to ask include things that have to do with the risks of using their company's service.
Contact your customers and suppliers for your company to find out if they'll link back to your website. You can offer them a link in return as a thank you for the favor, and often they're more than willing to help you out. The worst thing that can happen is that they'll say no.
If you are running an internet search, it is useful to know, that the first page of search results, are the ones that have the most pertinence to your query. As such, clicking on them, should provide you with the best answers about the topic of concern.