While a lot of writers tend to focus their websites for the adult viewer (whether that viewer be an editor, publisher, or adult viewer), those writers are missing out on a key demographic.
If you write material that is targeted to children, and children's issues, then it is a good idea to tailor your website to children as well.
The first step, understandably, is to build your own website (don't panic - with the right software its easy), so go out and pick up some quality web design software. It's not nearly as hard as it used to be to create a good looking website, as long as you make sure you pick one of the top quality design programs.
When you have decided on the general outline of your website, you should concentrate on researching your niche.
Go to websites that kids frequent and you can get an idea of what sort of content kids like (if you don't know any websites, just watch some children's programming on TV for a half hour and you're sure to find at least a few).
As well, investigate the best-selling children's books - there will be different genres according to the age group being catered to.
The benefits of creating a website like this are twofold.
First of all, and most importantly, the kids who read your work will have a place to go and learn more about the stories or talk about your stories. Second, when you submit your work to a children's publisher, they will see that you are in tune with what kids want today.
A publishing company may have a dedicated marketing team that determines how profitable your writing will be to them. If your website boasts thousands of views from children who like what you're doing, it will go a long way towards giving credibility to your work.
And here's an added bonus. If you set up a forum or a feedback section so that kids can respond to what they like and didn't like about your stories, then you can use that section to get ideas. Monitor the questions and comments on other kids literature forums as well to see what they are getting excited about.
After all, these kids are your target audience, so give them what they want and they'll stick with you.