Websites must be dynamic, with new information of value to visitors constantly being added, or visitors won’t come back. Relying on a webmaster who is not part of your organisation delays the process. Content Management Systems (CMS) provide the tools that permit you to manage your own site, adding and modifying content as needed.
There are several excellent, free, CMS available today. I often use WordPress for my clients with modest needs and budgets. The famous 5-minute install really works. And my clients find it easy to use. They can add and modify pages on demand and uploading photos is simple.
Read more about Content Management Systems here.