I pulled this from an article on http://www.1stwebdesigner.com:
This is really important. Clients can have different perceptions of what should be included in a web design, a logo and so on. To make sure everything is included and know how much time to spend with each project you need to get a mutual understanding of what should be included. This point is absolutely crucial!
Does the Designer have all the info they need?
Does the Designer need any files from you the client?
If you’re making anything that includes pictures, logos or other files you want to make sure that the Designer has everything at an early stage. Make a list of everything you want to be included and double-check that you supply it to the Designer.
No matter what kind of job you’re doing, the target market is very important to keep in mind. This will be determining some of the choices you make during your project.
How do you want to be perceived?
Company info and history
Are there any flagships? – introduction of services/products
Who are your biggest competitors? This can be used to make a design that stands out in very streamlined niches and to make sure not to come up with anything too close to what already is out there from a design point of view.
Make sure that you have a mutual agreement on how fast you can expect feedback during the project and how soon you can get different elements to the Designer that they will need along the way. If you will be away the last week before a project is due, you should plan this accordingly and make sure the Designer has what they need before you leave – or have another person to contact.