Hello Justin: Once you have picked a race series, create a spreadsheet with operational and/or running cost and another for capitalization. Your run cost dissects the car itself for per mileage replenishment and component replacement, consumables, engine, tires, fuel, entry related and sanction body fees. You will also need an annual number per employee, crew wage, crew travel and per diem, credentials, transporter over-the-road, and all building costs.
For the capitalization side, it would include the shop and office-based equipment, the race cars, chassis, electrical, and drivetrain parts, tools, support equipment, pit lane equipment, radio's, PC hardware/software, crew and driver uniforms, and wheel inventory. Make sure as with any business that you leave something in the capital fund to get you through the off-season.
I haven't really given your question a thorough enough answer with a spreadsheet attachment but would recommend that you pick your starting category, go to a few events with your camera, take pictures of everything that comes out of the transporter, is under the tent, the cars themselves, the pit lane, the number of crew members and anything else you can think of. With those photos you should then be able to zero-in on some answers. Try to talk to the best in the chosen category and you will find that there are plenty of people willing to get you moving in the right direction.
Thanks and hope to be able to see your team in action.