I am investigating the potential for constructing deep space ships for research, exploration, transportation and mining in the Solar System. I have no idea how

I am investigating the potential for constructing deep space ships for research, exploration, transportation and mining in the Solar System. I have no idea how to begin though. I do however have an estimated cost for the orbital construction facility as well as the cost of the first ship, est. size and weight, close to an Ohio class Nuclear sub. I am a middle class citizen, so funding is my problem.