OK, thanks again Thomas. It seems I had "Workbench 3.1" as hd0: and my hardfile as hd1: I just deleted the Workbench volume and renamed my hardfile as hd0: and it boots into Workbench (although it doesn't allow me to give the volume a name).
I also installed the Help file so I have a lot of reading to do.
Right now, the only problem seems to be that I can't access Amiga menus in the emulation: I launched Diskmaster, but can't access the drop-down menu to quit the program - I have to quit the entire emulation.
I also played with the RAM settings a bit, bumping them up to 2 Mb chip and 8 Mb fast. I'd like to be able to use the A4000 motherboard fast ram settings to get some more RAM but I guess I'll have to explore the helpfile to do that (I've got a 2.4 Gb CPU and about 1.7 Gb of RAM dedicated to the Windows 7 emulation; perhaps I should try Hi-Torro and just do the emulation directly in Mac OSX?