Another good way to achieve this is to make sure that you speak with your website development service, and ask to regularly see what they`re doing for your website. Here the more closely you work with them, the more you can help direct the evolution of the site and the more you can learn about successful website development and internet marketing.
As well as helping with the evolution of your website design, you will also need to provide materials for the service to work with. Here you will be required to give them such things as information regarding your site, pictures relating to your company and possibly the content for the website too. Of course while a website development company is well trained in creating websites and layouts and editing pictures etc, they won`t have any knowledge of your company or industry and so won`t be able to do the writing (while some web design companies do include copywriters in their ranks, they will still need a fair amount of information from you and would do better editing that than creating something new).