Having spent many decades taking children and then grandchildren to Ozzie beaches just keep it simple. Some little ones don't like the feeling of sand on their feet so just sit them on the towel and carry them to the water. Take a towel, sunhat, maybe a beach tent depending on how long you plan to stay at the beach (can be useful for a nap), baby sunscreen, some insect cream if needed, the old classic bucket and spade, plastic cups are good for sand play for little hands, drinking water, some pre cut up snacks in plastic containers such as watermelon pieces, bananas, or favourite nibbles. Never heard of taking talc and now frowned on anyway. Then just sit back, watch and enjoy.