that welder looks good for the money and like said before will be good for bodywork because you wont want high settings, which will make it easier for you to weld because it wont burn through the metal, id say go for 6mm wire if you didnt know (corrcet me if im wrong just what i use and found its good).
your going to need a grinder as your welds wont be that neat as youve only started welding (but everyone has to run the grinder round to neaten things up to be honest)
if your doing bits then leaving for a while (a few days) i would suggest getting a couple of cans of zince rich primer to prevent rust from setting in inbetween jobs (zince rich is rust resistant where as normal primer the rust can get through it and panels which look like youve done work on will have rust underneath)
but yeah get to it bud
