Applying for a job

[Starog]

Im hoping you guys can give me a few tips. I'm going to apply for a job, I don't really want to say what the job is, its a secretive job so it wouldn't be right (if anyone is really interested, PM me). I'm not sure if they are hiring but I was thinking if I send them an email, they might consider at least interviewing me. I know this method has worked but it's just a matter of writing something convincing enough.

Now, I don't have any experience in the field, I just have a great interest and I have some of the skills to be good at it. So I don't really seem like a good candidate, what type of things can I write to make them want to interview me?

I'm willing to work for quite a low rate at first until i prove I'm good enough. But I don't know what else to say. I'll mention why I think it'd be worth their while hiring me. Can you suggest anything that might go down well?

As always, any help appreciated. Sorry if this doesn't make much sense, I know it's a little hard to go off without knowing the job but I'm just looking for general things.