Gday Happy Camper. Restoring a car can be a big job, and we all have to start somewhere. If your knowledge of vehicles is limited, I would suggest that, even if your dad doesn't want to fix the Ford up, that you should at least get him involved in the appraisal and planning stages (he is a mechanic after all).
Where you start is determined by many factors- do you want to get it running & registered? do you want to do a ground up resto, leaving it in the shed until it is all finished? do you have a panel beating brother who can do this for you now for nothing?
Perhaps you could read a few articles in magazines, or go along to a club in your area (remember this is a holden club site
). Talk to dad and take it from there. Good luck and happy restoring