all i do to set mine up is get some scrap thats the same as your welding and play with the setting until your happy and away you go five minutes farting about but you can see all the penatration you need
 
and dont be to disheartened by your first few goes, it does take practice, the more you do the better you get.
the key to good welding is preparation; you cant weld rust, so grind it off, if the metal left is to thin, dont bother with it, cut back until you've got enough, lets face it, tissue paper thin metal wont weld nice ( with mig) and it isnt strong enough anyway.
and last thing buy a decent grinder its worth it.
 
It's easy to learn, hard to master.

I can't do pretty welds, but I can stick stuff together! I'm lucky, my dad does it for a living so I get expert tuition!
 
Just practice practice, practice, practice. Also ensure you have the metal properly earthed. I use an inexpensive Clark 135TE which suits most of my needs.

It doesn't matter what the weld looks like as long as it's a good strong one. If you need to flatten the weld, ie for bodywork, resist using a grinding disc, use the pad instead.
 

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