I think it helps when you start by making it fun, get them to write about something they are into like football players names or their toys names. Books with lots of bight pictures with space to write help and stickers as a reward for work well done is great for younger children. When Tyler started out writing, I used to do sheets with dots in the shape of letters to help him get the feel of the shapes. Now he writes on his own, but gets bored and fed up easily. We decided to make a pencil pot together that would help him keep his pens and pencils where he wanted them. And hopefully encourage him to keep them there.
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If you are looking for more crafts using Scotch Magic Tape, they have some great ones over on their Facebook Page.