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You need a C wire to power the NEST, you should have a 24 volt transformer that sends power to controller. If you do not then yes you would need to hook up a separate thermostat. If you do you can go directly to the COMMON side of the thermostat with a thermostat wire then connect it to the C wire at the NEST. You almost have to have a 24 volt transformer powering the control it may just mean that you can not hook it to the control itself.
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Yes I would try to use the transformer to power it, that transformer should be able to handle powering the Nest
You should hook them up to RH and C not RC
Just connect it from the equipment R and C 24 volts connections at the board.