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
i think they must keep their lot size small. This is how they can have the assurance that they will not lose their account. If you see, price always goes up and comes down. Thus, as long as one can survive in the market, he will get some profit and that is possible only by keeping his lot size low, so be carfull.