You won't be able to make them visible because they don't exist until you try to copy them to a file format that doesn't understand metadata. Then, Mac OS X creates the ._ files to store the metadata on that file system.
Use ditto in the Terminal to copy the files:
ditto -norsrc path/to/source destination/path
The command to make files visible is:
chflags -nohidden path/to/file
I'm not sure what you're asking.
You don't need to modify a folder at all. If you have files on the floppy you need to see to delete, type "chflags -nohidden " in the terminal, no quotes and leave a space, then drag the floppy volume (Finder, go Computer) into the Terminal Window.
To copy with ditto, open Terminal and type "ditto " without the quotes. Note that I left a space after ditto. Now, drag the files you want to copy into the Terminal window. Now, drag the destination folder into the Terminal. If that Is on an external floppy drive, then you can find that folder by going to the Finder, Go menu, Computer.
Hit return. It will copy all of the files to the floppy without the resource forks (which are what makes the invisible files).
If you have files on the floppy you need to see to delete, type "chflags -nohidden " in the terminal, no quotes and leave a space, then drag the floppy volume (Finder, go Computer) into the Terminal Window.
If you don't like using Terminal, then download Onyx for your OS from http://www.titanium.free.fr/download.php Navigate to Parameters>Finder and then click on the box in Misc Options to "Show hidden files and folders".