Identify your level of experience with trading. If you are a beginner, look for a broker with lots of guided options and integrated educational tools. Experienced traders will appreciate customizable trading platforms and market monitoring tools. 2. Decide what level of support you want. Some brokers let you take the wheel, while others offer 24/7 customer service or low fees for broker-led trades.  3. Try out different trading platforms. Most online brokers offer web-based and mobile platforms. 4. Advanced desktop command centers are usually available for an increased fee. 5. Finally, decide what types of investments you want access to. Not all brokers offer access to cryptocurrency or fractional shares, for example.