I use to go to the track quite often in California, so I'll tell you what I know about it here...
The minimum bet on a win, place, or show, which is a 1st, 2nd, or 3rd place bet, is $2. Any of the combos has a minimum of $1.
The thing you have to understand the most about hore racing is that the odds and payout are determined by the people and where th emoney is.
A quick example.. Say 10 people are betting on Horse A to win, and 1 person bets on B to win. Everyone bets $1. If horse A wins, they each get $0.10. IF horse B wins, he gets their 10 dollars. But of course the tracks tkae their share of money, but thats the idea.
Its a lot of fun for people who dont gamble much since the low bet minimums and Show bets make for lots of easy, small wins...