Can anyone advise if there are any fees involved when buying US stocks in FSMOne?

Hi, I have an FSMOne account and am interested to buy US stocks, Apple in this case. While I am a beginner atm, can I kindly ask what are some of the fees/ other matters that I should take note of, other than ensuring that there are enough money in my cash account? Eg. Are there monthly fees that I will need to be aware of?