As a new contributor, you may feel a little overwhelmed by the sheer size and scope of this project named Wikipedia. Don't worry too much if you don't understand everything at first, as it is acceptable to use common sense as you go about editing. We encourage you to be bold in a fair and accurate manner, with a straightforward, just-the-facts style.
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.
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. If you do get stuck, there are volunteers available to answer your questions, see asking for help for more information.