Stock trading should be treated as business not gambling. Risk to reward ratio takes preference than the amount of capital required for trade. Because without risk to reward calculation it is sure you will get out of the business by eroding the full capital (even incur debts).
Stock trading is chosen to make money through professional approach like understanding the underlying components price, volume, supply and demand using charts, price pattern and gap analysis.
Do a trade plan by deriving entry, exit, stop loss spots using outcome of the analysis.