So i have some advices:
1. make sure you are believe in your trading logic
2. record the reason when you open trade
3. take profit and stop loss strictly
4. back to the records when you close trade, and think why you are earning or lossing
5. according to the records , if you find something wrong with your trading logic, fix it
6. add your trade into a trade journal (advice from @GreatArkansas)
7. do the things 1-6 above again
Does any trader record the reason of opening trade? And how do you guys practice it? Let's talk about it.
The above comments are really great for new traders. These habits are what disciplines a new trader and it's important to your long-term future victories. In my opinion, you should apply these methods to the demo account. Anyway, it is a discipline that you need to practice and the demo account will help you do it for free, do not try to make money at the beginning when you do not have a good trading plan.