How much money are you willing to invest? You need programmers with experience in game development, programmers with experience in artificial intelligence, game designers, graphic designers. There's a balance that needs to be struck to find the ideal budget: the fewer people you have, the longer it will take to develop, increasing hours and thus cost, but the more people you hire the less benefit each additional person will provide, to the point where you are hiring too many people and thus unnecessarily increasing the cost of the project. This balance will be different for every project.

You will of course be able to find talent over the internet through any number of job offer sites, especially since this is a video game development project and I would assume virtually everyone whose skills would apply to such a project would seek job offers online.

If you have no budget and refuse to seek investment, maintaining your project as a free project, your main obstacle will be time. Amateur projects with no budget are hampered by lack of experience and lack of labor. That's not to say they are impossible, far from it, but don't expect to have a product to offer any time soon, even in an "alpha" form.

The biggest benefit to an amateur project would be the skills and resources you have to offer yourself. There have been very successful games that were initially single-person projects (such as Minecraft), and even some that were always single-person projects (the original RollerCoaster Tycoon is one example).

If you don't have the skill to maintain a project single-handedly, and you don't have the budget to hire people with the skills you lack, then that is when your project becomes impossible.

To make sure your project is as attractive as possible to potential investors and creative partners, you need to have a clear and detailed plan as to what you intend to create. What is the game and how does it compete with other games currently offered or currently set to be released in the future? What would you need to get this project started? What are you offering to these people in exchange for working with you? You need to convince people that you have a plan, that you can put that plan in motion, and that these people won't leave empty-handed.

If you are not interested in making business proposals and selling a product on the market, if all you want is a passion project, then what you need to do is focus on developing your own skills. Learn to code, learn to draw, learn to design, because it is your own passion and energy that will be driving the project in this case. You may find some people who share your vision and are willing to help pro-bono, but you can't count on this and even when you attract such talent you can't assure they won't decide to leave.

Well, even with simple graphics, the game that you want will require a lot of programming, so the very basic version can take anything from 1 month to 1 year to roll out, no matter how many people you hire and how much time you spend, if you're not proficient with everything to make the game yourself.

In fact, WarlordFred said everything I could tell you, if not more, so there's nothing really to add. I have no experience with making even a simple 3D game, so I can't advise on prices and amounts of time the development will consume. All I've done in nearly 5 years, with my two micro-teams of 2 people each, are these single-player 2D games:

https://store.steampowered.com/app/542350/Castle_of_no_Escape_2/

https://store.steampowered.com/app/611770/Void_Source/ (which is still in Early Access)

And, of course, the ШП in this giveaway, and a more recent ШПML5 "sequel" I mentioned in the giveaway description. To be honest, we desperately need to finish the development of Void Source this year, but it's just not so simple. If you want to make games, seek people with deep devotion to what they do. Even then, they can always become distracted... and are in their own right for that, too.

But if you feel it's your thing, you should definitely try it. And to succeed, keep trying for ages.