Pool A is a straight-up King of the Hill pool. Pick one team to win each week (you can pick each team only once). If that team wins, you keep going; if they lose or tie, you're out. But you're only out of that part of the pool, because...
Pool B is record-based and continues throughout the season whether you pick a losing team or not. Whichever team you pick for Pool A is also the team you have for Pool B. If that team wins, you get a win. If that team loses or ties, you get a loss. At the end of the regular season, the person with the best record wins. If there is a tie at the end of the regular season, the people who are tied move on to the playoffs, where it becomes win or go home.
The entry is $30. You can enter as many times as you want (before the season starts, obviously), but it's $30 for each one. The pot will be split: two-thirds to the winner of Pool A; one-third to the winner of Pool B. Note: The winner of Pool A can also win Pool B.