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
the best one is mini or micro lot size.because we can practice any kind of strategy without having margin call.so mini lots give us enough space to move and to practice and learn more about forex.trading with standard lots will be very costly for newbies since they are still not master and they may loss it anytime.