Changes in a wiki software

I have a wiki website and I need to customize the website I guess almost all of the customization can be achieved by installing widgets made available on mediawiki website. Following are the things need to be done - 1. Add captcha to post edits. 2. Add ability to show, edit a message on all pages. i.g. - "Help Wikitravel grow by contributing to an article. Learn how." shown on [login to view URL] 3. Have an easy editor to for users to create, edit articles so that they don't need to learn wiki syntax. 4. Add google ads. 5. Create a mechanism to track views of pages. 6. Add maps and add mechanism to show articles on map. i.g. [login to view URL] 7. Add mechanism to list authors below article.