I think the best way is to open a demo account and test out the trading platform in order to acquire an understanding of the broker.
Sometimes, traders ignore demo trading and commence with real one, but eventually they end up disappointed because it is not something they had expected.
Another approach includes theoretical base that must be examined before you choose a broker, because learning materials sometimes include information about how to choose a proper brokerage company. I'd advise to start off with this one. Just google the information about basic forex rules and how to start if your a total novice.