Before you can create a new page, you will need to create a Wikipedia account. The following video is a overview on the process to create your account.
Why do you want to add a new article in Wikipedia? Is there a lack of diversity, limited information, an underrepresentation or other reason for new information? You will want to make sure that you have enough information to support your article.
You can use the Article Wizard as a step-by-step process when you want to create a new article. The Article Wizard allows you to practice in your Sandbox adding text, upload images or link to media without altering a current article.