Hello and welcome to Wikipedia. Thank you for your contributions.
You might find these pages useful:
You can always experiment in the sandbox.
If you like, you can introduce yourself at the new user log, or write something about yourself on your user page.
One more thing: if you leave a note on any kind of discussion page it's always helpful to sign your post with four tildes (~~~~), which is automatically converted to your username and the date and time. Don't do this in articles themselves though as they are not 'owned' by any particular contributor.
Thanks again and happy editing!