Before you start writing your Wikipedia article, you should make sure that your planned content is not a published entry yet. Enter the topic of your planned article in the Wikipedia search bar. If there is no page about your chosen topic, you can go ahead and create a new page.
Just as important as reviewing what is in your article is making sure it is relevant, a criteria Wikipedia calls “notability.” Wikipedia has established detailed and precise criteria on determining when a topic is notable, and when it is not. In general, a topic, event, or person is considered to be notable enough for a Wikipedia page when it is significant to the public for a longer time. Individual criteria must be taken into account for the various categories of topics, e.g. social events or business enterprises. Wikipedia has detailed these relevance criteria in a separate article, where you’ll also find the defined notability guidelines for companies. For example, Wikipedia classifies companies that have at least 1,000 full-time employees, or which have at least 20 production sites, as relevant.