Good advice Matt!
Lots to consider here although you have definitely overcome one big obstacle already which is beginning to define your niche. Kudos!
Do explore what kind of business financing might be available through your local economic development organization or something similar (in Canada we have the Business Development Bank of Canada). They will usually require a very detailed business plan but that is a must anyway given the kind of investment you will both need to make, both in terms of money, time, risk, personal sacrifice, etc. You can find a ton of good business plan templates on the web. And do be prepared to front a good chunk of your own cash and/or collateral before any of the lending instutions will consider investing in your startup.
Also, you will need to consider the legal aspects of forming a partnership which no one should take lightly, even if you have been best friends since kindergarten
This will involve talking to a lawyer.
Is there a good market for what you want to do in your local area? That's another biggie!
Best of luck to you both and if you hang out here often it will definitely keep you inspired and get you asking the right questions.