<human>: I've worked in this retail store for about 10 months. It's a small store, so word gets around. I found out through gossip that a co-worker is leaving his position (this gossip confirmed something I thought I overheard him say about leaving, so I'm pretty sure it's not a rumor). I want his job, which would be a minor promotion for me. 

Through the same gossip, I also heard that another of my co-workers, who has only been working there about a month, wants to apply for this job. I have no idea if she will be considered, but just in case, I want to make sure that the higher-ups know I want this, too.

My question is, how do I approach the subject with my manager? The person who does the hiring is not someone I interact with in person all that much, so I can't go up to her and ask "Is Co-Worker really leaving?" like I would like. Instead I've got to write an email, most likely a formal one, and that gives me a great deal of anxiety. Basic human communication has always been a bit of a problem for me, and the composition and phrasing of even the simplest emails and texts can take me hours. Just the subject line is giving me the sweats (okay not literally but it is troubling me). And on top of that, I've never been promoted or anything like that before, or put my name in for one, so this is new territory for me.

Give me a shortened version of the text
<bot>: I want a job I'm not supposed to know is available yet, but I want to act quickly to put myself out there. How do I do so without committing a faux-pas?