1. Base of the neck

2. Generally speaking the tighter the choke the better the pattern at longer ranges.......but that is not always true. Let me know what kind of gun you have and I will let you know what choke/load combo I have achieved good results with.

3. There are many different turkey loads...are you planning on using lead or heavier than lead?

4. You do not need a scope...personally I prefer one if for nothing else than the clear sight picture.