There are loads of books which are worth a read but by far the best is to get yourself on a local evening course with proper tuition. I did that when I was 17 and have never looked back. Only way to learn is the practical way with somebody to advise you where your going wrong. Not expensive either as I remember.

I keep meaning to sort another one to perfect my tig welding but it will only lead to me buying a £2K proper tig which I can neither afford nor justify!