I'm pondering trading the ES or NQ, and was wondering about how margin works with these instruments. From what I've found, ES is $50 x index per contract. So, for ES trading at 890 X $50 = $44,500. It seems like this can add up FAST with multiple contracts. Does margin work the same with futures as with equites? If I have a 50k account, what could I trade utilizing margin? Thanks.