Data network documentation

We need assistance creating Microsoft Visio diagram to document network installations. We are looking for someone with at least a basic understanding of the components that make up a data network (e.g. router, switch, server, firewall...) and a high-level of experience with Microsoft Visio. We would like to be able to send a scanned image of a hand-drawn sketch and receive back a inuitive, easy to understand Visio document.