Never buy before 3PM (for positional trading). I have been burnt many times over. Try to buy between 3:15 - 3:30PM, later the better.
SL: Depending on your risk appetite: Below Weekly BO Candle / Below Daily BO Candle / 50% of Weekly BO candle / Below 20DMA
TGT: After a 10-15%+ vertical move, breakdown of 20DMA (on a daily close basis)