Im 5'5in 178lb i want a better future. a more hour glass like marilyn monroe. can someone tell me what i need to be eating and doing for exercise? etc

Your future . . .: Your future does not depend upon your figure & appearance. Your future is what you make of it, regardless of whether you have an hour glass like figure or not. That is not the point of eating healthy (search for mediterranean diet) & regular physical activity (search for strength, endurance, balance & flexibility exercises). Have confidence in yourself b/c of you, not b/c what someone else says.

I agree: If you adipose tissue that you'd like to lose then consider an increase in cardio and a balanced diet. However, do not always do the same exercise or you will increase your risks for stress injuries. Mix things up with running, biking, swimming, or circuit training. Ultimately you need to burn more than you consume.