Hello Volante !

I can just give you my point of view for the first point...

At my begining i was shooting everything, many many pics in a day... It was possible to shoot 300pics in a day of approximately the same landscape (same location)...
After that, at home, i've used my eyes for hours in front of my mac, to sort the good pics, the bads pics, te 'may be' pics lol ... and postwork them.

Today (about 5years of dslr later), I do sometimes some exercices like 'i have just 5 pics possible for today... no one more ! or 'just one pic today, 'THE pic' ! .. so it's just an exercice and it is very hard to stop taking pics lolllllll !!
When I'm walking outside in the search of pics, i ever try (today lol) to take the 'rights' pics, but not 30 or 50 pics of a subject because i don't which one will be the nice one ...

So, now it is for 'my' style of photography... Because a style is not another one, may be you need to take more pics to create your fully personnal point of view... In fact it depend on you ... and may be on your experience ..

... hope my pov could help you a bit...

I'm sorry, i have no idea for the second point, shame on me !

Olivier