For day-trading, there are tons of wealth hidden in these following books, which hold the power to entirely change one's outlook to a market.
- James Dalton's "Mind Over Markets"
- J. Peter Steidlmayer's "Steidlmayer on Markets"
- James Dalton's "Markets in Profile"
- J. Peter Steidlmayer's "Market Logic Trading and Investing with a Sound Understanding and Approach"
You can also refer to Camarilla Pivots (available in Pi). However, it is said that, Camarilla is "Poor man's Market Profile". A top-down approach must be used. First, one should try to understand "Market Profile" methodology and techniques, and by-default, the person will understand Camarilla (even, one might choose not to use it). This will enhance tremendous accuracy before pulling the trigger to buy on R4/S3 or to sell on R3/S4.
To add, indicators like Ehler Fisher Transform and CCI (14) can also help.
Fundamentals has very little to do in a short-term. It's all about order-flow, Volume Profile and Time-Price Opportunity.
After developing a concrete plan with affordable pre-defined SL, concentrate on trading psychology (there are awesome YouTube videos by Brett Steenbarger, Ari Kiev). Never risk more than 2% of capital on a single trade.
Trading at 9:15 am indicates that you are impulsive, but that's ok, some way or other we all are. But, we must try to listen to the market before expressing our opinion or view (the aforesaid books will certainly help).