Generally speaking it's hard to build muscle and lose weight at the same time. With an already small calorie budget the amount you can cut is also limited. It still comes down to CICO though - eat enough protein and decrease total intake and/or increase activity. Measure frequently and adjust as needed. Lift moderate weight/reps to preserve muscle mass. My first advice would be to seek out a local fitness competitor. They can outline a tried and true strategy in detail.