Uhh, that's a pretty vague description, GreatAmericaBoy.
The FastLane passes are sold at a counter located in the building in the center of the main area of Hometown Square. It is right next to the candy store in the same building - right across from the Whizzer enterance. When you enter the park, go to the right, past the IMax & under the railroad bridge, and it is almost straight ahead from there. There are signs that say "Fast Lane - Straight Ahead" and such. Should be easy to find.
I am not 100% sure when they go on sale, but I believe they go on sale between the opening of the park and 11am. I strongly suggest getting there early, especially if it is a Friday, Saturday or Sunday. I've gotten there at 1pm on a Friday only to find that the FastLane passes had sold out already.
The best rides to use it on are V2, Giant Drop and the water rides. The other rides lines move fast enough that it is usually a waste to use the Fast Lane. Raging Bull will at most be an hour wait if 3 trains are running and the line is completely full (both buildings). Iron Wolf may also be worth a FastLane punch if you have never ridden it before, or if you especially like Stand Ups. The line is usually long due to slow loading times. Be aware that it is a very short ride, so using a FastLane punch for it is borderline.
Hope the info helps. Have fun !
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Current favorite coasters:
Wooden: 1) Beast 2) Raven 3) Son of Beast 4) The Boss 5) Timber Wolf
Steel: 1) Raging Bull 2) Millennium Force 3) V2 4) Wild Thing 5) Mr. Freeze