Writing is something that must be taught to kids as early as possible. The first thing you need to train your kid is how to hold the right pencil. Start with a pencil not with a pen because kids can understand if they make mistakes and the pencil marks can be erased. The way to hold a pencil should be exemplified by parents.
The way you can provide good writing all this time is to hold the pencil part with your thumb and index finger. While the three fingers are on the back of the index finger following the direction of the hand. Then determine the distance between the fingers and the tip of the pencil, and the pressure from the pencil to the paper is not too strong and not too weak. Start with this movement for several times until the kid understands how to hold a pencil.