If you have some time, I would recommend checking out How to wire a pull station to a horn/strobe]this topic for some detailed information about how to do this. It’s a bit of a long read, but might be helpful in going forward.
In the meantime, if you wish to take the easiest route without much carpentry involved, I’ve made a basic list of what to get. This would be for a single sheet of plywood with junction boxes screwed directly to the board, and no conduit or wiremold. If you own a drill, you could do as Lambda suggested and drill an opening behind each junction box to run the wire on the back side of the board. Otherwise, you could simply have the wire pulled to slack on the surface of the board, and perhaps secure it with wire staples or gorilla tape.
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Find a good sheet of plywood that isn’t too warped or has too many knots (you can have it cut to size at Home Depot or Lowe’s)
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A single-gang box for the pull station
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A 4" box for each horn/strobe you wish to mount
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Pan-head wood screws to mount the junction boxes
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Any Home Depot or Lowe’s should carry 20/2 or 22/2 AWG bell wire or security wire. It will work for a low-voltage demo setup, but don’t use it for any high-voltage connections.
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In Stock AC/DC 24 Volt Switchmode 24 watt miniature SMPS regulated power supply, with 24 volt DC output, 1000mA, 750mA, 500mA. This 24VDC 1.0a power supply
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The barrel connector adapter with screw terminals on the website above
Now for some tools you’ll need if you don’t already have them:
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A screwgun
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Wire strippers
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Wire cutters
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Wire nuts if any of your devices have wire leads instead of terminals