That depends on your risk bearing capacity. Never risk more than you can lose.
It is probably for the best to go into demo trading and try to find out what cause the loss and how you can try to resolve them
Reviewing basically. Yes that helps.
Setting Stop Loss is a matter of trading skill. You have less stop loss in a volatile market but more chance to hit it. First, you have to understand the market momentum. If the price is impulsive then there is no problem in giving less stop loss but in a volatile market situation, the stop loss has to be much higher. And it is always better to give stop loss above the swing point.
The first step in trading is to gain knowledge about trading. In Forex trading, if trading is done without proper knowledge, the future of trading will not be good. Proper knowledge and discipline are needed to make the trading future better. Beginner traders are usually ignorant about trading which is why they make a lot of losses by trading first.
Every new trader should learn forex perfectly before investing their money in this risky market.