You want a page about a person
Start with the sources, not the draft. Independent coverage in depth decides it, and for a person a major award or an entry in a national biographical dictionary can stand in. If it's there, the free route is called Articles for Creation, and the guide walks through it, including the disclosure you post before you edit anything. Read how to get a Wikipedia page created.
You want a page about a company
There's nothing to apply for. A draft gets written by somebody who discloses who's paying them, then it waits in a volunteer queue, and the outcome turns on the coverage that already exists about the company. Test the sources before you write a word. The company guide shows how.
There's an error in an article about you
Don't fix it yourself. Editing an article about you, your employer or your client is the one move that gets the correction refused. You disclose the connection and post a request on the Talk page for an unconnected volunteer to act on, and the edit-request guide has the click path and the wording.
You want a citation or link added
You can't add it, and nobody can sell you one. The only route into an article that already exists is a request on its Talk page, and your source has to be independent and secondary. If it's the piece you paid to publish, this stops there. The citation guide covers exactly what to post.