If you do enough up front work first, it will be easier.
Go to the local library and take out some FREE books before you go buying anything. Then make a plan, to scale with what you are proposing. Talk to your local building official before you do anything else, they will help as much as they can because they want you to do it correctly.
You can even talk to local builders for some ideas, become a regular or stop by the busiest coffee shop with all the trucks in the parkin lot.
Then let us know what you need help with, we are a resourceful bunch.
Great advice is always here, the labor is DIY.