Sous vide temperature should be just under your target temperature: 116°F-118°F for bloody rare; 122°F for rare - end target 125°F; 128°F for medium rare - end target 130°F; 133°F for medium. More than medium you don't need to learn sous vide. Just cook your beef as you always have. Consider trying it done less sometime if you are feeling brave. You are missing out.