If you get a professional web design company to build you a website then it will be a very cost-effective way to drive visitors to your website and promote your business. They will take care of all the difficult aspects of the creation process and will make sure that your site is designed to spec and is both functional and eye catching. This means that you have to do very little, and you can have as much or as little involvement in the process of designing the site as you like. However the more input you have in the web design then the closer it will be to the vision you had for the site, and the more it will feel like a part of your brand. In any case there are some minimal things you can do, and a web development company will need at least some input as to what you want to get the kind of site you had hoped for.
The first thing to do then is decide on roughly what you want your website to look like.