I got lots of links. I would start with the prewriting book. It goes through the letters in a pretty systematic way. The Wacky Sentences is a good way to practice in a fun way. The link with Year 2-3 Dotted Lined Paper, make sure to look up that paper. That's lined paper that grade should be using. The first steps in writing will help in writing sentences. You also need to address standards, which is the Spectrum book. The last two address cursive.
A couple important points. Think of handwriting as a font. Each kid has a font. It doesn't have to be perfect. It has to be formed correctly but each kid can put a spin on it. Look up pencil grips. Make sure the kids are holding pencils correctly. If they aren't, they won't be able to control the pencil. If they can't control the pencil, the writing will be off.
Pre-Writing Practice Resource Book
Print Wacky Sentences: First and Second Grade Writing Practice
First Steps in Writing {Bundle}
Cursive Handwriting Workbook for Kids: Beginning Cursive
Wacky Sentences Handwriting Workbook: Practice Writing in Cursive
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