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If you want to get more acquainted with flies (and I think every serious member of this forum will), you have to deal with fly morphology and the scientific terms. In this forum, we have a glossary and a part "Overviews" where you find excellent explanations , e. g. http://www.dipter...ad_id=8790. Take the time and check the threads therein! Then, there are helpful websites such as http://www.ento.c...ossary.html or http://www.giand....mp;lang=en.
This forum has more than 3,200 members and only a few are the top experts. They cannot answer every question, that would be a fulltime job. I am no dipterist but have gathered some experience and try to help. But one has to do quite an amount of self-study. If your are particularly interested in Syrphids, I recommend the book "Britain's Hoverflies" (http://www.amazon...069115659X) - most of the species are found in Germany, too. Lots of photographs of native Syrphids you find in http://www.syrphi.... So the world of flies is discoverable - here we go!