Uhm, yeah... you'll need money. How much money you'll need depends on you, your project requirements, and your team size.
You do want to pay your team members, right? If you don't, they are working for you from their own graciousness, which tends to have a short shelf life. Once that's over with, they'll jump ship and work for someone else who gives them more than what you have to offer. If they've been working for you for any period of time, they'll start growing and gaining specialized knowledge about how to work on your project. You don't want that invested talent leave your project. So, you want to pay your people. Obviously. And you get what you pay for, so don't be skimpy on the pay.
Naturally, if you have employees, you'll also have to give them a place to work. Where will that be? will you lease an office space? will you bring them to your garage? What's the plan on equipment? What about heating, air conditioning, electricity, bathrooms, internet access, etc?
Shoot, it's getting complicated fast! Alright, maybe you want to scale back a bit. Maybe you'll just work alone for a while. Once you've released a simple game to bring in some cash flow, you can hopefully afford to bring on an additional team member for the next game. Can you do that?
The other route is to go hunting for publishers to finance your game studio. Good luck with that. If you're not established, you'd better have a very strong sales pitch to convince them to get in bed with you. Then, they'll tell you what to work on and when to deliver it. You'll have your game studio, your team, and all that, but won't be creating what you wanted. If you do well, maybe you could eventually end your financial dependence on the publisher.
I guess the bottom line here is that you are going to have to do a lot of research and the first step will be to write a thorough business plan on how you're going to make it all happen. You'll have a lot of challenges which you need to address.