Instead of asking , why not do the following - Find couple of brokers that you checked online and you are sure that they are no scam. Find the ones who are having free demo environment, and simply start testing yourself what ratio between account size, positions size , number of open positions leverage and etc. works perfectly for you. Because in here every trader will share his opinion which works the best for his needs, thus it might not work perfectly for you. I hope you are getting my point.