Melanie, in the beginning there's so much to process and take in. Why not submit to the rising kite contest anyway? It's a great way to learn, esp. since it's an SCBWI regional contest and you'll get some feedback as well.
One suggestion: follow the guidelines exactly. So many people get disqualified for this simple reason. And who knows, you might even win!
You can get some feedback here before your submit it, to try to make it the best you can. Just because you plan to publish it yourself doesn't mean you want to put out a substandard story. Writers learn from other writers. Read lots of PBs, both classic and contemporary. And you might be able to see some parallels with your own work. Study those authors intensely. There are lots of how-to books as well for self-study. Some of my favorites are by Ann Paul Whitford, Anastasia Suen, Barbara Sueling.
Happy reading and writing.