yes lot size depend on our account balance and i say that we work in market with low lots and we do not use big lots size order in market and beginners must use low lots in market and beginner follow the good trading strategies and beginners work with careful trading methods and beginners always understand the market risk management and work in market with experience then beginners make good earning in forex market
If you new traders you can trade .01 lot size and use stop loss minimum 20 pips your account, . If you have very experience of forex market you can trade same account 0.5 lot you use it is depend of traders experience, . .