If your kids are ready to write their first letters, you might want to try these alphabet tracing worksheets. As a guide, many kids start learning to write letters around 5 years old. However, the important thing is that they should learn it in their own time and it is completely normal if they want to start it later than others. Let's make sure it is always an enjoyable activity rather than a task.
This worksheet has all 26 alphabet characters, one letter on each page with both upper and lower case, with a picture they can also color in.