Ok I have the spl meter and have it set to 70
and I understand going through the processors manual speaker calibration and adjusting each speaker with pink noise.

My confusion is where do i set the processors main volume before checking the individual speaker levels??? Does it matter? Also where should I put my subs volume before making trim adjustments on the processor??

On my Denon, it does not matter where you have the volume control, it bypasses that setting and automatically plays the pink noise at the appropriate levels for calibration.

Depends on the sub, if you have one of Axiom EP subs, I would start at a lower setting on the gain control. Other subs, start about midway. After you've done it a few times you will get the hang of it....I always try to shoot for around 0dB on my receiver, if you end up being to low, say -10dB, then lower the volume on the sub.

In my pre-pro, the test tone for the speakers are output at the standard level for THX, which is 0dB (absolute volume setting of 82dB). In many pre-pros and receivers, they are output at the master volume reference level of 0dB. You then adjust each channel up or down using your SPL meter in order to equalize all channels to the same SPL of around 75dB. As Randy stated, for the LFE channel (being output by your sub), set the volume knob on your sub to a low setting (between 6 and 8 o'clock on Axiom subs) and then adjust the LFE volume from your pre-pro until you get the same SPL on your meter as the other channels. If you have a Radio Shack meter, you need to add about +2dB to what the meter is showing as it tends to be non-linear in low frequencies and underestimates the SPL. You can look up your meter's correction factors on the net. The absolute SPL level you calibrate your speakers to is less important than getting all channels to the same SPL with the test tones. Once you are done with adjusting the levels, you know that at your pre-pros 0dB level, all channels are outputting that same SPL. You can then crank it up or down as it suits you. Some folks also crank up the sub volume up a tad to feel the LFE effects even more.