Purchased a used Minolta Supreme freedom zoom elite 35mm camera. I have just loaded the film. The film advanced ok, however, now the indicator is flashing all of the options including an 88 where the picture number should be.

It sounds like the camera isn't detecting the film, but it could be a more serious problem with the hardware...whatever it is, fixing it usually involves swapping out the "brains" of the unit, if it isn't simply the film sensor mech. Even that can require extensive repair..
If it was advertised in good working order, I would return it, since it probably isn't. Communicate with the previous owner to see what can be resolved.
Good luck, and hope this helps.