Evertix
WP:FIRST contains everything you need to know about writing your first article. Wikipedia:Getting started is a good place to start for general editing. You may also find a lot of answers to specific questions at our Help Desk
For uploading pictures and other media, it's easiest to go to Wikimedia Commons (you can use your Wikipedia credentials if you're not logged in already) and visit the Upload Wizard. Wikimedia Commons can only accept files which anyone can use for any purpose. That means most content you find on the web is not acceptable. But for example, most photos that you've taken yourself are OK to upload.
Here's a screenshot of the Upload Wizard:
You start by selecting the files you want to upload, then you go step by step through the process. In the final step, you'll get some wiki markup that you can copy into a Wikipedia article. Let me know if I can help. :-)
Ariconte (talk) 04:03, 23 February 2012 (UTC)