I'm a day-trader that trade stocks which have a minimum Avg. Daily Volume of 1M shares. Until now, and because of my "R" size, I've entered a positions relatively with a small number of shares (No more than 1,000 shares in each trade). After a long period, my "R" is much higher and I'm going to trade relatively a large number of shares (up to 10,000 shares) in each trade.
My question: How do I enter a position with such a large number of shares?
For example: I want to Sell Short a stock when it's price fall below a trigger price of 19.38$. When I trade a small number of shares, let's say 1,000 shares, I put a stop market order (That's my prefered order for entering a position), and I'm in with all the 1,000 shares (sometime with a little slippage) when the stock's price of 19.38$ has been hit. Now, what is the right method to enter the same stock, with the same trigger price, but with 10,000 shares?