Vacuum op. accessories and Tune-up

Hi all, glad I found you. I just bought a 1977 450SLC with 150K on her, solid but kind of a basket case.
No major repairs needed but the ignition system is in need of some
attention (a little bumpy at idle, and she stutters with very slight pressure on gas pedal.) After that, zoom... The gas milage isnt bad compared to my 2k5 jag either!
What does concern me is that none of the vacuum accessories, (door locks, seat locks etc.) work nor do the cruise or A/C. Zero response when I operate the controls, (a/c is the manual type with levers and knobs and heat is fine). The fuses are all in place. I'm wondering if the vacuum systems have been toyed with or if i'm dealing with many seperate issues.
This is my first experience with a Benz. she was driven daily by the last owner but had obviously been left sitting for some time before that.
If anyone could assist me in checking, repairing and replacing these vacuum systems and what valves and sensors i should immediately replace would be greatly appreciated.
I'm driving her now and plan to take my time learning and restoring her to A-1. Will employ the use of a mechanic for jobs i shouldn't take on, but for fun and cash sakes I want to do what I can myself. Do intend on spending a bit though. Why not, she was only a grand.
My first concerns are the tune up and A/c..(gotta have a/c by summer!!) Then door locks etc, followed by a new interior and finally paint.
Love to hear any tips, who should work on and paint her, (will do interior myself) and what to expect... I haven't been this jazzed about a car since i was 16!
Thanks All, Robert
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