Hi, don. The optimum would be for you to "steal" some flooring from inside a closet and replace the boards with holes. Honestly, this is probably a job for the pros.
A "cheap and dirty" solution is to first find out what kind of wood it is, measure the hole size, buy a hole saw bit where the ID of the bit is one size bigger than the OD of the hole and cut plugs from the same variety of wood as your floor. It will be much easier and safer to use these drills in a drill press but you can drill by hand if you are very careful. Sand the plugs with a taper so they fit exactly into your holes and glue the plugs in. Sand the plugs flush on the surface and refinish the sanded area. If you have some experience with finishing, blending colors and so on, you should be able to get a pretty good match to the existing wood. You will have to fill the center hole in the plugs with Minwax wood filler or Bondo which does add to the finishing and blending difficulty.