Well, not knowing what the SOHO network consist of, it would be difficult to know exactly what is required. However, I will point you to a site that has a great selection of stencils for Visio that will help you out. Those sites are:

http://www.visiocafe.com/
http://www.cisco.com/c/en/us/product...l-listing.html

Within those two sites you should be able to get what you need for your assignment.

Hope this helps...