I’ve bought a second hand Clarke 90, plan to use with argon/co2gas (disposable initially as I’m not sure where I could store the gas). I’m welding outside, but inside a campervan. What wire should I be using with 1mm steel? Also, would 1 disposable bottle do a few practice lines and about 30cm of weld? Do I need to purchase a regulator separately? Thanks in advance! Will show my attempts once complete!!