The intended tone is friendly, clear, and serious, appropriate both for newbies who want to find a way to help, for old-timers who are just wondering how something gets done. If a job needs more hands, by all means, make the description attractive, just as long as you stick to Plain English.
One of the aims is to steer new contributors towards useful contribution, so please consider WP:BEANS when describing jobs.
Start it using Wikipedia:Manual of Style, as well as information often left in articles it is linked to ('What links here' on the located on the sidebar, or press alt-j). Other article may also suggest appropriate sources to reference.
The Wikipedia:Article Incubator holds articles that may not currently meet one of Wikipedia's content criteria but still have worth and just need a little TLC. It's a great way to contribute new content and practice your writing skills. Other jobs are available too, such as evaluating candidate articles for graduation and finding new candidates.
Copy editing is making formatting changes and improvements to an article to make it clear, correct, concise, comprehensible, and consistent, that is: make it say what it means, and mean what it says. In Wikipedia, this is done in accordance with the Manual of Style, often referred to as "MoS". Top 10 reasons to join the Guild of Copy Editors:
Improve your skills in the craft of copy editing
Read interesting articles that you might not normally look at
Gain a significant amount of Wikipedia editing experience
You get to remove copyedit tags, you can use a special tag while copy editing to prevent interruptions, and you can leave a tag on the article's Talk page with your name on it after you finish
Take pleasure from correcting horrible spelling and grammar
Improve the article as needed to conform to conventions and style manuals.
Check links to the article, fix double redirects and find articles to insert links leading to orphaned and badly orphaned articles.
If you find a statement in the article surprising or suspicious, find a reference to support it, or remove it from the article.
Nominate bad pages for deletion, vote on the rare AfD or PROD you come across.
Check the article's history and talk page to see how many people you don't know work on many articles about things you never heard about. Look at their user pages and contributions to appreciate how much work is done on Wikipedia.
Wikifying is formatting using wiki markup (as opposed to plain text or HTML). This can be adding internal links (wikilinks), headings, layout, infoboxes and other templates, or bolding/italicizing of text. There are currently 96 articles in need of wikification, plenty to go round!
WikiProject Wikify holds special Wikification Drives every second month in which you can earn barnstars for your work.
Ten simple steps to thoroughly wikify an article:
Check for copyright violations. Long segments of text without wikilinks can sometimes indicate that the text was illegally copied into; also look for other red flags). Instructions for reporting violations are at Wikipedia:Copyright problems.
Add wikilinks where appropriate and check that they work as expected. Please do not link terms that most readers are familiar with.
Wikipedia gets thousands of edits per day - unfortunately many of these are vandalism. As an RC patroller you are the first line of defense against such abuse, ensuring that readers of Wikipedia are not faced with vandalized content where they expected to find a useful article.
Get new spam and cruft shot on sight deleted appropriately
Some people, either acting in good faith or maliciously, create new articles which aren't suitable for inclusion in Wikipedia. By participating in new article patrol you can ensure that these articles are deleted as soon as possible. And for that rare gem of a good article right out of the gate, New Article Patrollers are in an excellent position to make sure that it's nominated for the Did You Know... section of the Main Page.
Detailed knowledge of the core content policies and deletion criteria
Providing unbiased commentary is a great chance to improve your Wiki-relations. Instead of debating, you can read the arguments of opposing editors and suggest a compromise that is in Wikipedia’s best interest. By doing so, you will learn a lot about the policies.