To add pictures, use [[Image:Example.jpg|alignment|size px|alt text]]
Then you will see the image, that doesn't exist, will be a red link to edit like this File:SandboxImage.jpg, which you can then follow and upload the image.
For instance here's a picture of my Vespa, reduced in size and centred:
Kyle's Vespa
kylet 19:06, 16 April 2006 (UTC)