Maybe try this one:
http://www.amazon.com/gp/product/007...lance&n=283155
It's easy to make racing terms sound hard, but they're not. Basic terms (typically seen on a beat), a Lift is a windshift that helps you point higher on the tack you're on (a clockwise shift is a lift for a starboard tack boat), and a Header or "knock" is the opposite, you have to bear away just to keep your close-hauled sails filled. Remember, a lift on one tack is a header for the other tack, so if you're to the right of a competitor on a beat, you're praying for a rightward wind shift, and vice versa if you've positioned yourself to the left side of the other boat(s). This is also why we typically stay on lifts, but tack on headers so as to convert it into a lift on the other tack.
Read the racing rules about overlaps; if you've got one, you're the inside boat in the mark-rounding circle, which is way better than being the outside boat.
Good luck, and keep racing, it's the quickest way to learn the finer points of sailing, and since most racers are always looking for crew, it's free lessons, and they may even give you food and beer. Can't beat it with a stick, good luck.