If you are building the high power version with parallel output transistors, with VR2 set to maximum (50R), I would expect each output transistor to be passing about 300mA (ie there will be about 30mV across each of the 0R1 
resistors) when the supply rails are at +/-10V. This does not vary very much when the rails are +/-22V. The actual current depends on the gain of the individual output transistors. The Q7/Q8 ccs will supply a current to the bases of the output transistors which is equal to the Vbe of Q7 (~0.6V) divided by the value of VR2, so with VR2 at 50R the ccs current will be ~12mA. This gives 3mA into the base of each output transistor and if it's gain is 100 (a typical value) the collector current will be ~300mA.

As for initial setting-up, before power is first applied I would adjust both VR1 and VR2 for maximum resistance. After power is applied, VR1 is adjusted to set the output dc offset to near zero and the quiescent current (and 
current sharing) checked by measuring the voltages across the 0R1 resistors. If all seems well, VR2 is adjusted to raise the quiescent current to, say, 1A. After a short period to allow the transistors to warm up, the output dc 
offset is reset to near zero by adjusting VR1. Back to VR2 again and raise the quiescent current to, say, 2A. Wait a while and reset the output offset.

Unfortunately, the adjustments of VR1 and VR2 interact and so the setting of the quiescent current and output dc offset is an iterative process but after about four steps you should be able to get the current and offset somewhere 
near to the required values. At this point, it is necessary to let the amp idle for an hour or so in order to ensure that thermal equilibrium has been reached and that the amp is at its normal operating temperature. The 
quiescent current and output dc offset are now trimmed to the required values. These are best rechecked after a further settling period (say about 30 minutes).
