For meatballs, the fundamental ingredients are mince, breadcrumbs and egg. After that you can add any herbs and spices that you like.
Put your mince into a bowl with chopped garlic, chopped onions, chopped herbs, spices, salt, and pepper. Move the mixture around a little bit at this stage with your hands so that the mix is even, then add breadcrumbs and an egg. Mix everything together with your hands until you have a good consistency - not too moist and not too firm. Shape the meatballs.