Quote from austinp:
<i>"Well, he opened an IB account with 30K, and he said he's starting to trade 5 contracts at a time..."</i>
Trading the ES, two contracts = $100 per index point profit. Average +20pts per week, +$2,000 per week. That's $100k annual if achieved, which is obviously very possible in current market conditions.
If said friend is good, $30k will become much more and size can increase with same degree of risk % to account balance.
No reason to trade bigger at first, 2 contracts are plenty for training wheels period of learning.