Toning after weight loss advice

Hi! I’ve managed to lose 60lbs through diet and walking. However, I have definitely lost muscle, and my abdomen looks worse now than before I lost the weight. Any advice on exercises to tone the lower abdomen/flank area to improve weight loss and appearance? I still have another 40lbs until my goal, but adding in weight training is my next step, and want to make sure I’m specifically targeting that area.

Any advice appreciated!