Before I Power Up Original Mac???

We are cleaning out a climate controlled storage unit we've had for decades. So, I now have back at my house two early Macs. Looking for any suggestions y'all have on what I should do BEFORE plugging them in and turning them on to see if they even run any more. Claude AI said this was the place to go for recommendations - including possibly getting a recommendation on a local (Dallas) reputable shop that might help. I'm handy enough to launch into opening up the cases and inspect things. But, not going to do any actual electrical work on a board or drive mechanism.

Here's what I have:
  • 1984 ORIGINAL Mac (I pre-ordered through the University Consortium at the time).
    • Serial #F4172JYM0001
    • Some number of years later, I upgraded it to a MacPlus, so it has likely had a lot of work done on the inside
    • Pretty sure the internal floppy drive was upgraded at that time too (to 800kb)
    • With it, I have a 45Mb Jasmine DirectDrive external hard drive and a Novation SmartCat Plus 300/1200 modem
  • 1987/1988(?) MacPlus
    • Serial #F842C5KM0001A
    • With it, I have a 40Mb Jasmine DirectDrive external hard drive
  • 1984 Printer
Photos attached.

THANKS in advance for any help.
 

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  • My Mac Serial No.png
    My Mac Serial No.png
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  • Moms MacPlus.png
    Moms MacPlus.png
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  • Moms Serial No.png
    Moms Serial No.png
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  • My Mac Serial No.png
    My Mac Serial No.png
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  • My Original Mac.png
    My Original Mac.png
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  • My Mac Printer.png
    My Mac Printer.png
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  • Printer Nameplate & Serial No.png
    Printer Nameplate & Serial No.png
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