When you first start using a new horse racing system, it is a good practice to start off by placing paper bets with it first. With the amount of garbage racing systems on the internet, I would be broke by now had I used real money on every system I tested.
Another misconception that many people have is that a good horse racing system will never lose money on any day or any month. This is not true at all, as every system will have up and down trends of results. The better horse racing systems will have a staking plan that is perfectly suited for its strike rate and frequency of winning.
Good horse racing systems are based on strong mathematical principles and probability. Every system will bring some amount of risk, but the really good systems take calculated risks, and have been proven to be successful over time.
A good horse racing system that I am currently using is integrated into a software with a staking calculator. The entire selection process is almost automated, and you learn more about this software at the website link below.