If you are closely associated with the subject you want to write about, you have a conflict of interest and will find it very difficult to write a good, neutral encyclopedia article. You will probably find it very difficult to write an article which will not look like advertising to other editors – and using Wikipedia for advertising has been against official policy for a very long time (see WP:SPAM). If your article reads like an advertisement and/or is about a subject that isn't very clearly notable, it will most likely be deleted very quickly.
Review your intentions. Wikipedia is not a space for the promotion of products, services, or websites. If you're here to tell readers how great something is, or to get exposure for an idea or product that nobody's heard of yet, you're in the wrong place.
Don't make a new article for your own product or website. Most often, when a person creates a new article describing his or her own work, it's because the work is not yet well-known enough to have attracted anyone else's attention, much less reliable sources. Articles of this sort introduce conflicts of interest and are usually deleted. Wikipedia does indeed have articles about popular products and Web sites, but it is not acceptable to use Wikipedia to popularize them.
If you have a conflict of interest in relation to your proposed subject,