Abaxius,
First of all, depending on the level of activity and your weight, WW has a slide ruler that helps you determine the number of points you have earned. Second, in one day you can do as much exercise as you like, but you can earn a maximum of 4 activity points. Third, you do not ever have to eat those points. They can be banked, but like all banked points they are yours for 7 days and then they're gone. The way it would work for me would be like this: I'm in the 24-29 point range. When I earn 2 activity points, I add that to the top number. So, my top number becomes 31. If I eat 26 points that day, I can now bank 5 points for a day when I may need the extra points.
Hope this helps. You might want to look at the activity slide at your next WW meeting to get an idea of how WW does this. Also, you'll be getting all this information at your 4th. WW meeting, but it sounds like you are ready to go *now*.
Good luck on this program. It's great and lots of people are successful.
