All subjects should include writing. Teaching writing is based off the strokes needed in each letter. Said child also should be around 5 before attempting anything outside of child led writing. As children don't have all the bones needed to hold the pencil correctly. You can start with this book https://a.co/d/84x827r
How old is your child? I started off with tracing Worksheets and a maze book from kumon. It got her used to holding a pencil
He is 7 but since I’ve been a bit lost I haven’t done much. He can read now thou a bit
There is some great copy work curriculum. But, do you also mean learning how to form their ideas into sentences?