Waqqashanafi
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) 04:54, 19 February 2012 (UTC)
Citing Sources edit
There is a "Cite" toolbar at the top of the edit window which allows you to automatically generate the required wiki code.
You click one of the templates, e.g. "book", and fill in the details.
More information can be found in Wikipedia:Referencing for beginners or the citations tutorial (the below video will play best in Firefox or Chrome):
Hope this helps,