Any aspiring writer should consider submitting work to children's magazines. It's a great way to gain credibility and boost your confidence. You still have to do your homework, though, on submission guidelines and current topics of interest. Check out the article below for writing ideas:
Marketable Topics for Children's Magazines
Click here for a comprehensive list of children's magazines, along with links for their submission guidelines. Each magazine typically specifies what types of writing they are currently looking for.