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Tig flowrate for what you're doing roughly 6-7 litres per minute (LPM) and mig try 7-8 LPM .
Bit late now but that knob that says on / off should be basically a tap so you should be able to adjust the gas flow ie the ball in the glass using that knob to 8 LPM , turn your gas bottle main valve on (slowly) half to three quarters of a turn is fine , take the tension off the wire feed Roller and turn the mig on , press the trigger on the hand piece then mig should run but wire shouldn't spool out .
While doing that look at the glass tube and where the ball is , try turning the flow rate knob that one on the left that says on - off and see if you can get it to move if it does move it to 8Lpm .
Gas flow rate can be a bit up or down from 8 but if you get little holes in the weld you need to increase it , just for chits and giggles check your hose connections to make sure you don't have any blockages kinked hoses or loose connections .
If your getting flow on Tig I'm betting it's something stupid like a blocked hose or connection , your problem is not the argon it's either not getting out the end of the gun or at the right rate .
The hose I used for TIG is a custom made by BOC guy(didn't charge me at all) 'cos the connection on the TIG torch won't work with my cheap scratch start TIG unit as it has no gas connection on the machine. BOC guy used an adapter and made the hose for me so I can connect the TIG bottle regulator directly to the TIG torch. For MIG, I am using a separate see through hose from Pirtek, which appears to be working fine without any leaks(I use clamps on both sides as it is not an ideal hose for welding gas). 
