Okay, yeah. It's a lot of work for a volunteer project. As you say that you are new, here is what you should take into account:
1- How much time it takes to do the project: When you said 'short', I thought a graphic novel short. From 20 to 40 pages maximum. That's a short project, and it will take 3 months, take or give depending if its with colors, the style, how much free time the volunteers have, etc.
But you presented 12 chapters, and no insight on how many pages per chapter. That's A LOT of work and compromise for a volunteer job, specially if you want to publish monthly. That means around 20 pages drawed, inked, colored in less than a month. That's a lot. For no money. So you must seriously rethink the size of the project.
2- You should had left a link for the draft project. I know that you may feel protective of your work, but specially for free work, an illustrator want to know in what is he diving into. And the writing says a lot of the project. Because one thing is the shape of the story. that you have writen there, and another its about what is really is the story. The one word that perms the script. Is it 'love'? 'friendship'? 'fear of death'? There is a lot of concepts that drives the writing, and we can't know just looking at the trailer. That's what is done to sell the project, of course, but you are looking for people to work with, not to sell it too.
3- You should also add some comic pages of what you expect to see, so people around that skill will look into the opportunity that you are offering. Its good practice, because you are looking for partners, not employees.
4- I don't know if you considered it, but if you are serious, try to add to the project the monetization via Kickstarter, or the like. I have never done that, but with the promise of money if the goal is reached, its much better motivation to work than just 'the experience'. Because, you know. People need money to eat, not experience.
With all that, if you want to work in partnership with someone, by all means, do it! But start with something little, not something that will take more than a year of planning, because as you have said already, you also lack the experience of managing that kind of work, and more than one year is very taxing. Sorry if I am assuming some things here, I am just telling how I see it from the post.
The best of lucks in you project -be it this, or any other!
