Just bought a 1972 mustang - question about maintenance?
The beauty of owning an old car is ease of maintenance, repairs, and modifications. You don't have to abide by the rules set for new cars, to a point.
Buy yourself a repair manual specifically for your car. This will give you the the information you need to do repairs and maintenance, and help give you confidence to do this yourself. Parts and maintenance generally cost much less than for newer cars, but the intervals can be more often.
A decent repair manual can be bought at an auto parts store for $20-$30. When you have questions, that's what we're here for. You are welcome to make me a contact if you like. I have fixed and modified many makes and models from the 60's to the 00's.
You got a cool car. Good luck with it!