"Hello Mr. Perry, my name is (redacted). I'm a person with an idea and I don't trust just anybody with this idea. It's an idea for a new book. In the Aliens Series and maybe even crossing it over to AVP series. I have only a few pages actually written out. I haven't had much time to finish it because of my work and the kids as well. I'm also trying to become a school teacher or the coach. Please respond back. I love your work and I think if you and me get together on this Idea it will kill to be in it.
Dear Red --
I appreciate your enthusiasm, but there are some kinda harsh realities I have to point out regarding this kind of shared-universe project. There are rules about how they get done.
First, and most importantly, nobody is buying Aliens or AvP novels right now, the market is closed. It might open up again, but as far as I know, it isn't open now, so even if you had a finished book, you couldn't sell it.
Second, and I know this sounds off-putting, but the idea is not really that important in this kind of book, it's the execution that matters. (New writers think the idea is primary, I used to think so, too, but I found out that ideas are cheap; every writer I know has a drawer full of them, and no matter how brilliant and original they might seem, somebody has almost certainly duplicated or actually done them. Not much under the sun.)
More than a few times, I've had folks come up to me at a party and make a similar offer: "I have this great idea for a novel; tell you what, I'll give it to you, you write it, and we'll split the money."
That's not a good deal for me, nor for most professional writers. The real work is in the writing, not the idea. I can come up with half a dozen pretty good ideas for a book in five or ten minutes. Writing them takes a lot more effort.
Third, I've got a list of my own projects lined up, and if I did feel like getting into a collaboration -- which, at the moment, I don't -- there are several writers whose skills I know and trust that I could work with.
If you want to write, then that's what you have to do, write. If you have other stuff that takes precedence, I understand, but if writing isn't near the top of the list, you won't get it done.
Material of your own is better, and you need to get something finished you can show around. The way you get hired to work in a shared universe is to develop a track record, so the folks doing the hiring know you have the chops to pull it off. It's a buyer's market, they can pick and choose from a bunch of professionals who'd love to play in those arenas. Without something professional to show them, you really have no chance to get asked in.
Sorry to put it so bluntly, but that's how it is.