Plan to do handwriting on a daily basis until your child can remember how to form the letters and do it reasonably well.
Make certain that your child follows the arrows (or writes in the correct direction) when forming letters. Be certain that you supervise your child because it is very difficult to un-teach something that your child has taught himself to do the wrong way. Some children can’t decide which hand to write with. Please do not fret over that, let him decide which hand he will write with that day. Some-day he will settle on his preferred hand. After your child can remember how to form the letters and do it reasonably well, you should have handwriting classes as needed and you will decide that based on how well your child is doing. You will know that your child is doing well.