1) I can't boot from the HardDrive.  When trying to boot from
      wd(0,a)/netbsd, an error appears "invalid format".  The NetBSD

That would indicate the kernel on the hard disk is corrupted.  Did you
actually `halt' the machine after copying the kernel, or did you just
press the reset button?

      % mount /dev/wd0f /mnt/msdos
      /dev/wd0f on /mnt/msdos: Incorrect super block.
      %

Try:

mount -t msdos /dev/wd0f /mnt/msdos

The default type is `ufs' (a.k.a. Berkeley `fast file system').