www.handwritingforkids.com/ is a great site for teaching youg kids for practicing handwriting. Most children are taught to write the alphabet in chronological order, ABC…etc. But try this different approach. Progress from the simplest to the most complex characters. This site has great way of teaching writing with animation showing the 'right' formation of letters

UPPERCASE letters animation

lowercase letters animation

Also check 12 Rules for Good Cursive Handwriting by Christopher Jarman for a good list of tips for Hand writing practice.