Try to look through various lists in net with different Forex brokers for getting some general information about them. Your next step will be chacking reviews about certanin brokers and their approval in regulatory agencies, it's a very important step for providing a high-level security for you and avoiding possible scam. After that you'll need to check their terms and rules for withdrawal and deposit, transaction costs and general prices, level of quality for their customers' support and type of their trading platform How to Choose a Forex Broker: Everything You Need to Know .
Experienced traders recommend for example such brokers as the ones on AvaTrade's Facebook page , Think Markets, FXCM, IG, Hot Forex, FXOpen etc.
It's easy if you compare different investment sites correctly. Look for platforms that offer you guarantees to compare between different brokers. I tried Topbrokers.com forex brokers but there are more platforms for the USA.