There is atleast one very good book on this subject :
Tony Greenland's Panzer Modelling Masterclass.
He goes through all fases of modeling, from tools, kits and paints to PE and weathering.
Barnes and noble have it. But only as a used copy.
http://search.barnesandnoble.com/booksearch/isbnInquiry.asp?userid=mHu1ENemzA&isbn=1841760951&itm=3
Amazon got it too, but I couldn't link it.
Here is what the cover looks like.