welcome to the Wiki, and thanks for your contributions! I noticed that you went through quite a bit of revisions with your submissions though. It is probably easier (and causes less clutter in the page log) if you used the "Show Preview" button at the bottom of the edit page to test your edits before saving them. Thanks!
I've also added some dummy content to your Sandbox. Feel free to edit it as much as you want (using the preview button) to familiarize yourself with the Wiki syntax.