OP, this is idiocy! Return that money immediately! If you're going to borrow to trade, at least be patient enough to build up your credit rating so that you can get a loan at a decent rate.
I don't know what the system is in the USA, but here in Canada, with a good credit rating you can get balance transfer rates at 1% fee, 0% interest for 6 to 18 months. You can also qualify for lower interest lines of credit at less than 10%.
I'm not a wealthy man, but between 6 credit cards, I have over $24K of balance transfers at 0% that I am trading right now in a margin account with 30% margin requirement (80K purchasing power). However, I trade rather cautiously and will be able to return this money when the time runs out. I also have an additional 14K borrowed and invested in my RRSP at prime + 1% ($100 minimum payment).
By the way, those of you questioning the balance transfer method: take a cash advance against one credit card the day before the second credit card pays off the balance with the balance transfer.
Be a little more patient and build your credit profile before you borrow. Those are stupidly high rates.
