A 40-year-old woman complains of polyuria and fatigue. On examination, BMI 35 Kg/m2, HR 80 bmp, BP 128/76 mmHg. She has acanthosis nigricans. Her family history is remarkable for type 2 diabetes. Her random blood glucose is 180 mg/dL. And Her HBA1c is 7.2% What is the most appropriate initial management plan?