Have I gotten this part right?
compactflash.device in "DEVS"
fat95 in "L:"
CF0 in "DEVS/DOSDrivers"
Is that all I need to know? Or is there more to it? How about the startup sequence? (the part that looked most complicated)
Forget about compactflash.device since this is for the A600/A1200 PCMCIA port only. Fat95 is correct, and you can use the CF0 file after modifying it a little. Just open CF0 in a text editor and change compactflash.device to scsi.device. Next you must change the Unit number, which must consist of the Unit number of your card reader followed by the LUN number of the slot you want to use. In your case it should be 10 for Unit 1 and the first slot (LUN 0) for example.
You shouldn't have to change anything in the Startup-Sequence.