Welcome to the site and the hobby. This is a great place for help and info.
1) Pro-touring and g-machines are one in the same but don't get too caught up on names and classifications. It simply means an old car made to perform better and in particular to turn and stop better since that was never really a strong suit of older American cars.
2) The best one to start with is your favorite because it needs to make you happy and keep you interested and motivated during the process of building it and driving it so know what you want and what you want to spend way in advance. You should research available aftermarket items for a car especially if you have a budget and performance requirements. That being said, Mopars aren't really the best platform to start with from an aftermarket support standpoint. But if there's no budget, then track down a B-Body and fire up the credit card!
If there is a budget, you should consider 1970s era GM stuff as it has a lot of support from the aftermarket, relatively more modern, and cheap buy-in for the initial project car.
3) If it doesn't break you financially and it makes you happy, then you should have no regrets. Careful planning will eliminate cost over-runs and not doing things 3 times because you changed your mind will also keep the budget in check. Those are the 2 biggest reasons project budgets go out of control every time.
Good Luck!
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