Our very own Ash G did an article in the complete kit car mag a while ago giving a great intro to welding , very helpful as it focuses on the type of welding you,ll be doing ...thickness of steel etc / making the same car etc .
I,m sure there,s a link on this forum somewhere

to the article...if not, I,m sure Ash won,t mind me saying " send Ash a PM " ...he,ll point you in the right direction.
If you are up this way at anytime ( visiting saturn maybe ) I,ll give you as much scrap tubing as you can carry
I,m sure all would agree...practise practise and do some more practise & you,ll soon get the "feel" ( & sound ) of when your welding is getting good
cheers
andy