Diet and lifestyle is such a personalised thing, that it won't be possible to generalise and guide you .
Instead please consult a qualified expert nutritionist to help you through your weight loss journey
Next Steps
Also just whey protein for your breakfast isn't a healthy choice, as you haven't mentioned any details of your diet consumption it would be super difficult to guide you
Health Tips
Your diet has to be a balanced diet in each meal with the right proportion of carbs-protein-fats-vit&minerals only then your workout is gonna work perfectly , as Diet is 70% & Exercise is just 30%