Question 1.
Your scope is fine. You dont say what distance you are wishing too shoot too, but I use similar magnification on all my rifles and shoot out too 400 meters. It's capable of more but that's a good distance.
later on you might choose to upgrade for better clarity and quality in other areas, but Ive had a Burris on one rifle for years and its worked fine.
question 2.
Unless you dont wish to be in the hills with everyone else, which is understandable, just go for it. You have to be out there to have a chance and won't see anything from home.
Question 3.
I rotate through my hunting areas about once every two weeks. But even then depending on the area Ill divide it up and hunt different parts of same spot more often than that. IE, upstream one week, downstream next week.
If it's got good numbers then it won't hurt. Trickj is not to fire heaps of shots at once.