Could someone helpme out to creat alert indicator?

Inputs
• Push alert
• Plot the line on the signal candle

Sell Alert
• Candle close below the lower Bolinger band
• At the same time, lower Bollinger band above the middle of Digital subDem channel


Buy Alert
• Candle close above the upper Bolinger band
• At the same time upper Bollinger band below the middle of Digital subDem channel