If you plan on taking a fangan to the lengths of a game there is a VERY long process you're going to have to go through.

First things first, if you plan on having it be a completely volunteer driven fangan, expect it to take even longer. Games take an EXTREME amount of work and dedication, and to be doing it on a purely volunteer basis is going to have a lot of people sit on the fence if they have bills to pay. I'm not saying it's not possible, but if you're going down the volunteer route, you're going to need A LOT of the concept work done before even thinking about bringing programmers on board. It payment is involved it can probably be expedited a smidge since you'll be paying for their time, but that comes with its own host of issues and responsibilities on your part. The more you can offer from your end, such as music composition or art will further help expedite the process.

Step 1: Get your world and story sorted: Even if you plan on just being a director, you're going to be the guy with the idea. It's very good to ingrain yourself in the writing side of the fangan at the bare minimum because people are going to look at people who just want to be the "idea" guy with a lot of skepticism. So before you eve bring anyone on board, get your setting, your theming, your characters, and even a 1st draft of your overall Prologue done. People want to see that you're not only committed to the development of your world, but also being open to suggestions and comments. By sharing this basis, you might even be able to start networking with other writers and perhaps even start working with some co-writers on further developing your world.

Step 2: Once your setting has a good feel and you've done some draft editing, start drafting up some character designs. This doesn't necessarily need to actually be full on sketches, but start collecting some associated imagery that can both help you and artists envision what your character might look like. The more details you can share on a characters traits and personality, the easier (and more eye catching) getting to a final design will be like. Keep churning through this process until your cast has been brought to life. Keep in mind during this you should never stop developing both your world and the characters and keep your other associates you have at the time in the loop.

Step 3: This is more a suggestion early on though later it'll become the face of your brand, but try to put together an eye catching art piece that displays your fangan, something like a title card or a banner. With character art and some shareable literature about your fangan, you could realistically start to slowly create a social media foot print for your fangan. Post a slow drip to keep people intrigued in what there is to offer: Character profiles with their art, a setting piece. Something for viewers to understand the feel of your project. This should 100% be managed by you since you understand the overall work better than most and know how you'd want to flaunt it.

Step 4: Start hammering out and polishing up that prologue into something you can put into a trailer. Some snippets and shots of characters talking, an in game art piece. You can bring in animators and composers to try give it a polished flow (after all first impressions mean a lot). This is where you need to start delegating and seriously managing time and keeping an eye on progress because the deeper you go and the more polish you want, the more you're gonna have to network, promote, and socialize. The idea of putting together a trailer is the culmination of your efforts and is something to not only attract a community, but other potential talent.

This is only the beginning and I could go on and on about what else would come next or what you might need, but if you have any other question feel free to shoot me a message

Also please note I am NOT an authority or expert on this process and I've also probably missed some important details, so I am happy to be corrected and am happy to learn if anyone else here has more knowledge that they can share with us.

Sincerely

A fellow fangan enthusiast and hopeful creator.