I came across a wonderful blog post about web design tips for non-profit organizations at Vandelay Design Blog. Since non-profits are generally on a slim budget, this is a great resource in helping you determine which features and information to include. Once you have a defined scope of work, it is then easier to get estimates and quotes. If you are a non-profit on a budget, take a look at the link above to help you figure out your next steps. In the meantime, take a look at this simple website I made for BAEDN, non-profit on a very tight budget. It will provide ideas of what else you can include.