depends on a ton of things...if your a daytrader then you should use either a dollar amount, or a 5 min chart based on your entry...with the 20 ema...
my basic advise is this...
once you enter a trade place your stop at a price you can stand to lose...if the trade moves with your direction at the first 30-40 cents go to break even immediately...or..scalp it...
you'll need to determine the "days trend" and watch the futures to be able to make a sensible entry, stop and exit strategy...
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