Hi Destiny,
2% should be your risk per trade. This is what you will be risking if you stick to your stop out price. So let's say you take a 5min ORB on a stock that costs $50. Let us say that VWAP is the closest tech level and you use that as your stop out point. VWAP is 25 cents from your planned entry. So you plan on risking 25c per share on this trade. You are risking $100 on the trade, thus you take $100/$0.25=400 shares. Now I use that example to show that $100 is a lot of risk. At $50 a share price, that is a $20,000 trade and 67% of you buying power (assuming CMEG). I have been trading live for 5 months and I have worked my way up to $36 risk per trade. So maybe 1% risk per trade may be better. $100 would scare the heck out of me.
Many traders prefer using share size and start with 100 shares. I really like basing the share size on the risk I am willing to take. So I don't have my nerves swing from low to high on an expensive stock. Others choose % buying power and have DAS calculate the share size. But again I like the $ risk constant, it helps my nerves and forces me to have the exact stop out price before I take the trade. DAS will calculate the share size for you. I just click the button on my layout with the $ distance from my planned entry to my predetermined stop out and it already knows my $ risk per trade and thus instantly calculates the share size.
I hope this helps.