Ho Sopodo,
Don't even think about trading the ES with a mere $500 margin account would be my advice. IMO, you need around $5,000 or more per contract traded if you're to survive and prosper. Is it possible to do really well with a lot less? Yes, of course it is, but the smaller the size of your account, the greater the odds that are stacked against you.
Below is an extract from a FAQ that I'm working on (not yet posted). Some of it won't make a lot of sense because it's out of context but, hopefully, you'll get the point about account size.
"Generally speaking, the ability to trade size tends not to be the main concern for most retail traders, because their accounts aren’t big enough for it to be an issue. However, what is an issue is the exact opposite; their accounts are too small. Trading too much size with a small account is a recipe for disaster. It’s another monkey error made by novice traders who focus on the potential gain, as opposed to the potential loss. The ES can easily move 20 points in one day. If you’re trading say, fifteen contracts, that’s a profit or loss of $15,000! Great if it’s the former and a bummer if it’s the latter! Even if you’re happy to risk 5% of your equity on any one trade (not recommended by the way), you’ll need an account funded to the tune of $300,000, in order to comfortably take a hit this big and to stay within your 5% risk parameter. Many brokers advertise margins as low as $500, i.e. you only need $500 in your account per contract traded. So, in theory, you’d only need $7,500 in your account to trade fifteen ES contracts. Don’t be lured by this – it’s financial suicide. You’re far more likely to ‘blow up’ – i.e. lose all your money - than you are to end the day eleven grand plus change to the good. The index would only have to go against you by ten points and your entire account would be wiped out in a single trade."
Tim.