Does the disk not even start loading when you reset the Amiga? Could be that the harddisk has a higher boot priority than the floppy drive.
You can check this by holding the two mouse buttons when you reset. You'll get to the early startup menu; check under boot options. The highest number will boot first! You can override this by choosing a device in the list on the left and clicking Use and then Boot.
3.1 roms won't give you cd-rom ability. You need a cd-filesystem; see above. Drivers for your pcmcia cd-rom may be found at amiga.resource.cx However you still need to find a way to get the files to your Amiga... You need an Amiga or PC with internet connection and floppy. Amigas can read 720k floppies.
