I agree with Neil.

I would add this:

1. You will never make any money by marketing race information to the mug-punter losers that populate TABs - they don't see gambling as an investment, and are not prepared to pay for better information than that which is free on the wall, newspaper, sky channel etc.

2. It will be difficult for you, a new player, to compete in the "serious" market because accurate class/weight/race ratings already exist, are readily available, and are cheap (perhaps even free). Therefore, I doubt you could compete on price.

3. If your selling point is that your computerised class figures are more accurate than those available in the market place, you would have to prove this to potential purchasers by direct comparison over thousands of races/ horses. By revealing such information, you would allow simple reverse engineering destroying any value in your IP.

4. You could sell your race ratings, selections, or analysis. Some such services come and go almost overnight, while some (such as the service connected to this site) have stood the test of time. The percentage of start-up businesses that fail in the first year is high and I bet racing services are even more likely to fail.

5. For the above reason, I reckon you'd be better off punting your money on your selections than spending money on advertising.

Good luck!