We're glad you wish to help develop Wikipedia, and we hope you enjoy participating in this virtual community. Linked below are some brief introductions containing all the basics you need to use, comment on, and edit Wikipedia.
The contributing to Wikipedia page is an article that provides information, links, videos and other resources on the basics needed to edit Wikipedia. The five pillars is a popular summary of the most pertinent Wikipedia principles. The community portal is a central location to find collaborations, tasks, and news about Wikipedia. If you do get stuck, there are volunteers available to answer your questions, see asking for help for more information.
Note: The ability to create articles directly in mainspace is restricted to autoconfirmed users, though non-confirmed users and non-registered users can submit a proposed article through the Articles for Creation process, where it will be reviewed and considered for publication.