I wouldn't be overly concerned with finding the '3D Workspace'. I'm pretty sure all those tools are on the default dashboard, but if you don't have the 3D tools you need on your existing workspace, just right click on an existing toolbar to bring up the toolbar menu and add the 3D solids.
The only other difference is that you would have a grey background as opposed to black. This happens automatically when you are in an ISO (sw, se, ne, etc.) or parallel view anyway. You can select these from the 'view' pulldown or by invoking 3D orbit. (tip-if you use the middle mouse button to pan, hold shift+middle mouse button to orbit).
The 3D workspace you are looking just might be called 'Visualization' in ACA.. it's been a while since i've seen the default set up.