Setting Goals :
Set your goals high it helps you to attain an even ground. In other words you are averaging 170 but would like to improve that by 10 pins. What should you do ? Well since a 510 series = a 170 average you should set your goal at a 600 series each time you bowl you will probably not hit it very often but you will more than likley be averaging 180 or better before too long.
It helps to set your goals at about 15% above what the norm is for you this keeps them high but realistic in the sense that they possibly could be attained.