Re: casting angle
Everyone who posted so far is correct, but I wouldn't get too hung up on a specific technique. 10 and 2 is a good starting point but you can modify it to what suits you and the conditions. The wind, your location, distance, even the fly might change your cast. For example I always throw my clousers with an oval or sidearm cast(partly because I'm tired of unwanted piercings and broken tips) but it works for me. Try a few different casts when you get into the water and see what works.
Like Lefty says in his demos, "as long as the line is moving, I can cast it"
The best way to a fisherman's heart is through his fly.