Look for a broker with a wide choice of assets and a high rate of payout. If you have a preference for a particular market check that your chosen broker offers trades on this.  Choose a broker with a demo system so that you can fully check out their platform and get comfortable with their interface before making any live trades. There are many new brokers appearing on the market every day, while they may be great brokers they will be largely unproven and will not yet have gained a reputation (good or bad). It is advised to go with the established and proven brokers who have had time to prove themselves.
Binary options trading has one big advantage when compared with other trading possibilities. The outcome is calculated percentage wise. As such, traders can split the original amount to trade in various smaller units. Because the outcome is a percentage, the result is the same. Any binary options “how to” guide should start from splitting the risk as much as possible. This is called diversification.