Freezing inside round roast help

I got this 1.5kg inside round roast and looking for advice on freezing it. I want to use the beef in thin slices for stir frys, sandwiches and other stuff. What would be the best way to freeze all the beef? pre slice it or freeze it into dinner portion steaks and then slice when I'm ready to cook them. If anyone got any suggestions on how they do it I would be grateful. submitted by /u/BrotherWilhelm