i think that first of all, you should make a plan and check the mistakes in your past trades, which made you suffer losses...and then you should try to make a strategy for 500 dollars....but it would be better that you only make a strategy for 400 dollars investment and keep that 100 dollars for bad times in trading....you should remember that you should not risk more than 10 percent of deposit and also do not over trade and always apply stop loss to your trades....