This is just a thumbnail, gleaned from the stockcharts blog, showing some correlation between price and volume which may be some of what you need. The illustration below has some notes as follows:

  1. In an uptrend, volume and price usually move in the same direction. This means that volume will increase as price moves higher and decrease as price corrects back. As this pattern continues, the uptrend will resume. Volume is confirming the uptrend. The opposite happens for a downtrend. Volume will increase when price falls and decrease during rallies to confirm a downtrend.
  2. Negative divergence between volume and price occurs when prices continue to rise in an uptrend but volume declines. This is a sign that the buying pressure is waning and the uptrend may be about to reverse to the downside. This is further reinforced by the gradual increase in trading volume during drops and decreases during rallies.
  3. The same concept applies to a positive divergence in a downtrend. If volume decreases as prices make lower lows but increases during rallies, prices may be starting to bottom and the trend may be about to reverse from bearish to bullish.

As you can observe on the illustration above:

  1. The volume on rising days is larger than falling days >> Uptrend is likely to continue.
  2. Volume on down days is progressively larger than on up days >>> Uptrend is likely to stall >>> Can lead to sideways price action, re-accumulation or distribution.
  3. Price and Volume Divergence: The price increase continues, while the volume decreases. >>> The uptrend is likely to reverse.
  4. Volume increases during downtrends and decreases in rallies >>> Confirming that the downtrend is dominant >>> Time to sell.

Of course, these are just probabilistic theories. It means that they are unlikely to happen, but once they do, it has a high probability of being true, you can wait for such confirmations to guide your entry. Besides, Volume will be better used in centralized trading markets such as commodities and stocks.