The game starts on Sunday. These orders won't happen till monday, due to the market not being open.
You can buy and sell stocks, in the basics. You have 100 grand to spend, but it's 29.95 dollars per order trading fee. You can borrow double what you have, but it's a pretty high fee for the loan against your money.
From there, look up what Short Selling is, and start looking up companies you like and think would do well.
When the game starts, we'll help you out with the orders (we don't have access to them either).