What are you trying to copy? Don't forget floppies can only hold just over 1mb of data each.
You can buy floppies ready formatted, but as you already have them (unformatted) try going to windows explorer and right click on A and then click on format. If you have already done that and it didn't work you would need to reboot to DOS or use a boot floppy to get to DOS and then put the unformatted floppy in and type "format A:" without the quote marks and press enter. When that has finished put the next floppy in and do the same again - until you have formatted them all. When all done switch off and reboot as normal.