I have a Brother embroidery machine that uses floppies - my computer doesn't take floppies but I have a small and inexpensive external 3 1/2 inch floppy drive that holds the floppy disk and designs can be downloaded from the computer just llike one woud to a flash drive ...Just be sure to learn the format your machine uses....
As for the colors of thread. that is difficult to say as designs use different colors....
The floppy disks have been rather difficult to find but only a few are needed as your designs will be in a file on your computer and downloaded as needed. send a pm if you need other information or have a question...