Suggestions:
1) Avoid overleveraging. If you fail to follow this rule and position size beyond your mental capacity, you will have your head handed to you very quickly.
2) Know exactly how much you will devote to the account. Make sure it is money you can afford to lose. Take 20% of it and blow it all to get it out of your system. You will make mistakes. You will be frustrated. The instrument itself moves seemingly in random fashion. There are points in the stream that you can pull profits from. But realize, when you are starting out, you are either going to be lucky in not knowing what you are doing, or more likely to lose your stake. The latter is very common so be aware of it. It will be your price of education.
3) Add the other 80% in only after you have proven to yourself you can consistently pull money out the instrument. This may take at least a year for you to "get it". If you can remain flat or eek out a profit on the second year, you are progressing in the right direction.
4) Continuously look for edges to exploit. Focus on price action and what it is telling you. They are there but you have to put in a lot of screen time to see it. Do not think that you can walk up to your computer and use it as a virtual slot machine. You MUST treat this as a business if you are going to survive. If you are going to dabble, my strong suggestion is you are in it for the wrong reason.
5) Learn to play both sides of the instrument. Never have a strong bias heading into the trade.
6) If you find yourself trying to predict, you are lost. You must know and have done your homework.
7) Know everyday when economic reports are coming out (usually in the morning). Never be in a position before the release. They can be volatile. A 10 point ES move in 15 minutes can sting if you are leaning the wrong way.
8) Avoid overtrading and becoming addicted. Decide on the hours you will trade. Its a 24 hour instrument making it that much more easy to gamble. Keeping positions open has its risks. Trading in the overnight session is not recommended. Too little movement and more susceptive to get your stops hit. Avoid it.
9) Get proper sleep, eat right, and excercise. You will have to battle with your best everyday.
10) Know how to determine and measure volatility. This is very important for obvious reasons.
11) Sit down and write a set of trading rules. Be true to yourself and stick to them religiously. I can't emphasize this enough. In trading futures, there is little margin for error.