Check out the Getting Started FAQs info over there-------------------------------->.
That should get you started and answer a lot of your questions. The rest is putting in some stick time to learning how this game works. I started back in May and I seem to learn something new every day. Lots of good guys in these forums will help you as well.
To answer your questions, aiming points are only a reference...the ball will usually go the distance for the club selected with full power assuming a full swing and ideal conditions. Adjust for distance, wind, elevation etc. OK, that should really confuse you now...what will help the most is to practice, practice, practice.
Welcome aboard and be careful or you might get hooked on this thing.
Joey