--Is a cable for power supply included? In the movie, things connecting to peripherals were used. Do I need to make it by myself if I do not belong? Then tell me how to make it.
The adapter cable comes with each one, but it's much easier to cut the wires and clamp under the bolt.
--to shunt the PSU connector to start it up if you are not using enough cards
In any case, you need to pull down the PSU contact to the GND. Without this, the power supply (ATX type) will not turn on.
You can make it directly or through the connector on the board.
Have you tested any limits on setting a certain amount of miners up on a parallel connection? Or maybe it is better to buy a few Bitmain PSUs if doing a larger scale?
The limit is molex connector power limit and your cable gauge limit but if one board consume 10 watts and the limit is 11 amp per pin, you can power up at least 6 cards on one molex chain (60w split between the 12v and 5v)