Cylinder sizes and pressures can differ but some of the more common sizes are 9l, 10l, 20l and 50l. Filled anywhere from 137bar to 220+bar. 20l bottles are the biggest I would recommend for home or light workshop use.
To work out gas amount/welding time, it's (cylinder size "litres") x (pressure "bar") / (flow rate "litres per minute"), so a 10l bottle at 137bar would be 1370litres and 137minutes welding time at an assumed 10lpm, where as a 50l at 220bar would be 11000litres and 1100minutes welding time at 10lpm. I hope I've got that right!
You don't need a licence and you will be looking for argon mix or straight co2, the latter being cheaper but produces taller welds, there is gas comparisons in the tutorials section. http://www.mig-welding.co.uk/welding-gas.htm
For argon mix you need an argon regulator and a co2 regulator for co2, they have different connections so make your gas choice before you buy your regulator, weldequip sells both types, they will both be rated to 300bar, more than enough for most cylinders. At minimum I'd say a dual gauge so you can monitor flow rate, or a separate flow meter if you want more precise control.
Hope this helps.
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