Review the '10 Reasons why I need a website' section and determine what you want your website to do for you.
Make a list of the pages that you want included in your website, so you can begin gathering information.
Surf the Internet, find and log the sites that you like and what you like about them. Take notes.
Choose the colors you want and notice what you like and don't like while you are surfing the Internet.
Think ahead and begin gathering information - Write the text you want included in your website, gather the photo's you want included. If your business is seasonal or you can only get pictures of your product at certain times, make sure you get those when you can, as they may not be available when you need them. For example; a nursery has to get the photo's of their gardens and trees while they are in season and in full bloom even though they don't want to begin work on their website for several months. If you are a manufacturer of a product to be sent away, make sure and take photo's before it leaves your property as you may never get to the destination. It is also nice to have "before and after" photo's, so remember to take the photo before you begin the work if you are in renovations or restoration of some sort.
Creative 4 Site has a Web Design Checklist which will help you to determine what you want in your website and how you want it to look.
Plan ahead, it will save you time and money in the long run.