Which indicator is more effective for intraday?

 For any kind of intraday, trading you need two types of indicators.

Trend Indicator - You need an indicator to tell you if the particular instrument is trending up or down or is flat. So you need a means by which you can compare the current price.

VWAP serves that purpose. Its an Intraday indicator that tells you Volume Weighted Average Price for the day. If the current price is above VWAP it means the trend is positive if the current price is below VWAP it means the trend is negative.

Oscillator - Once you identify a trend you need to figure out entries and exits, oscillators are momentum indicators that can be used to spot pullbacks and trend reversals. RSI and Stochastics are your friends here.

Always have a fixed target and never be greedy. I am not saying it will give you a sure shot at profit, first please paper trade for at least 10 to 20 days and make you comfortable with the strategy.