Help with SMA Crossover Demo script

Hi I'm currently in the process of learning to write a script. Here's a very basic SMA 34/4 crossover script. Is somebody able to help me with adding the following functions to the script.

1. Add an alert and indicator to close a short or long trade whenever any candle touches the SMA 34 line?

2. When a SMA 34/4 Crossover has been executed (a Short Trade condition) add an alert/indicator (Titled “Add”) every time a Green bullish candle has closed.

3. When a SMA 34/4 Crossunder has been executed (a Long Trade condition) add an alert/indicator (Titled “Add) every time a Red bearish candle has closed.

4. To used on 15m/30m/1hr/2hr/4hr/1D/1W timeframe charts?