Any source for finding out how to fly a VFR approach?
The bitter reality is - it depends and to find out in some countries is archeology. Many time you will find procedures in a VFR manual, if published. In some case you find things in the AIP. In many cases of more overruled civilizations you find procedures for each individual airfield aside with the approach pattern - there are some real odd examples of non-ICAO-standard traffic patterns and ugly procedure descriptions, which you have to look up for each and every destination.
Sometimes you even find important information not in aviation literature, but in daily newspapers - there are very famous examples, like German Bonn-Hangelar where a Mr. Nüse from authorities declared the blue line on the VAC as mandatory to hold by 150 meters - if you want to laugh, look at the related !!!!storm.
One advice from an international flyer - do not, repeat, do not, engage an overhead join approach as long as you are not absolutely sure it is common at that airfield/in that country! If you do the UK CAA standard procedure to cross 2000ft midfield to go dead side, you are in great danger in certain countries to be hit by i.e. a BE33 or TB200 doing downwind at 2000ft instead of 1000ft because of their brick like descent.