You will need a shock pump (high pressure low volume) A regular tire pump will not work. An air compressor will blow up the fork.

It is normal for the lockout to not fully lock the fork. What it does is increase the platform (how much force it takes to start compressing the fork) The threshold is- may be adjustable with the gold knob on top of the blue cap.

The blue cap is not meant to be removed and doesn't have a valve. The spring goes in one leg only.

Other than looking for cracks, wear and check it holds air there isn't much you can do to check the fork.

And the SRAM website will probably be your best choice for finding a manual.