Flat / Small Gap up Open is expected in Nifty, Still Nifty is BEARISH mode so we can expect small range market before it go down. we can look to short 18400, 18360 levels for lower Targets.
Buyers and Sellers Zones - When price breaks the zone, Buyers zone will become Resistance and Sellers zone will become Support.
For Best entry, Wait for first 5m candle close. Go long when High breaks, take Short when low breaks. Keep SL high/low of the first 5m candle.
Refer the chart for detailed Intraday Support and Resistance levels.