On low carb diet, what is the minimum carb, protein, fat and fiber that i need each day?

To many variables!: It depends if you exercise a bit. You can be more liberal with carbs. Obviously if calories don't come from carbs, they come from protein and fat. Most people on a low carb diet consume 100-120g per day of proteinm 40-60g of carbs (after induction). Aside from fats in meat and dairy, go with nuts, monosaturated oils (olive, peanut, canola). Vegetables are low caloric density, so eat plenty!