Trading is very similar to gambling. It can be addicting and full of emotions. To counteract the emotional aspects of trading, you should have a trading plan BEFORE you enter any trade. This plan should be the result of testing and research that fits your trading style.
Trading is a learned skill and you have to grow into it. Stay small while you are learning and slowly scale your position size up. Just because you can trade $50,000, doesn't mean you should. Trade with a small amount of capital until you have proven you are successful. Then start slowly increasing the size of your trades.
Many traders jump in too fast without doing any research or testing and blow out their accounts very quickly. Take your time and you can learn it.
My answer to the question of risk/reward is "it depends." No two traders are the same. We all have different goals, capital, experience, etc. Part of trading is discovering what kind of trading you like, what time frames, etc. Part of that discovery process is finding the ideal risk/reward blend for you.
There is no right answer.