ok i just got an early x mas present, my first 22 and my first rifle with a scope......i was wondering at what distance should i sight in my scope, i go to fleetwood so my options are 25 yard 50 yard or 100 yards.....im a complete scope newbie....also what does the top turn thing do and what does the right side trun thing do....i would think one is up and down and one is left and right but i dont know which one....ill be hopefully going next weekend weather permitting to sight it in....thanks