I am a noob with blender. Please be as specific as possible. College students have been doing this for me, but I am unable to understand them.
There are various dxf import / export plugins, but they are not enabled by default. One of these is specifically for Import (read carefully).
In the User Preferences window find the Add-ons tab.
Then when it's ticked, the
.dxf import option becomes available in the File->Import menu