
If you have a good sense of what you need, enter what information you have and I'll do my best to provide you with a reasonably accurate estimate.
If this is for a new website, it may be helpful to first sketch out a rough outline of the website to determine what content you plan to include and what functional elements will be called for. You may also want to draw up a preliminary menu of pages.
Otherwise, these questions should be helpful as a starting place for organizing your thoughts and preparing the materials for a new website, or for redesigning an existing one.