To get the seeds, you'll need to wait until the sunflower has fully matured, which can take a few months. It's like waiting for a present on your birthday - you know it's coming, but you're not sure when. As the flower starts to dry out and turn brown, you'll know it's time to start harvesting those seeds.
The process of harvesting sunflower seeds is actually pretty simple - you just need to cut off the flower head, and then rub the seeds off with your hands or a small tool. It's like combing through your hair, but instead of tangles, you're looking for seeds. And, just like with hair, you'll want to be gentle so you don't damage the seeds or the flower.
Once you've got your seeds, you'll want to dry them out completely to preserve them. This is like putting food in the fridge - you want to keep it fresh for later. You can use a low-temperature oven or just air dry them, depending on how much time you have and how patient you are.