custom boot disk

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Can anyone provide a pointer to a good how-to on creating a customized
bootable disk?  Specifically, I'm trying to understand:

1) How do you create a 64mb (for example) memory file system as part
   of the boot procedure?

2) How do you instruct init to mount the newly created memory file
   system and then populate via an image containing system files?

3) How do you instruct init to start executing a specific shell or
   "c" program once the memory file system is populated?

J