Don't underestimate how time consuming making digital negatives can be. You will spend alot of time calibrating your equipment, and in this case you will also have to maintain a darkroom.
I would venture to say that you would get a superior result (at least with silver prints) if you use the traditional process.
You may want to start with 4x5 or 8x10, 12x20 is an expensive format to learn with.