Here's a finger tracing worksheet for your youngest children, to help familiarise them with the letter formations. Start on the dot and follow the arrows!
Luck Finger Tracing
Finger tracing is a good introduction to writing, and this gorgeous rainbow page is a great way to practise!
Finger tracing is a good place to start when practising handwriting but of course you can use this worksheet with a crayon too. Why not get the kids to colour it, then laminate and use it with a dry wipe pen?