I started Wikipeding in April 2010 by expanding a stub related to a village in North Lincolnshire (Alkborough). This is an ongoing project. However, my main interest is in the Roman Empire, and specifically Hadrian's Wall. I'm currently involved in a little project-ette to create entries for each of the Milecastles along Hadrian's Wall. It takes much longer than you might think!
First impressions of Wikipeding? There's always more that you want to do, than time you have to do it.
Wikipedia has keystroke combinations that can speed up your work, like Alt+⇧ Shift+F to jump to the search box, Alt+⇧ Shift+E to edit, Alt+⇧ Shift+P to preview, Alt+⇧ Shift+S to publish your edits, and many more. Those are for Windows users. On the Mac OS, press Ctrl instead of Alt.