If you ever think a page or image should be deleted, please list it at the votes for deletion page. There is also a votes for undeletion page if you want to retrieve something that you think should not have been deleted.
If you're still entirely confused, or would like to get a better grasp of your wikipedia skills, and you have an IRC client (or don't mind getting one), check out the Bootcamp. It's not what it sounds like, but it is fun and can help you with your editing skills.
If you're bored and want to find something to do, try the Random page button in the sidebar, or check out the Open Task message in the Community Portal.