drawing a line and draw a up/down arrow on a candle

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Im tring to program a very simple indicator to draw a line and draw a up/down arrow on a candle.

I cant figure out how to use those style, index, draw etc.

I have a very simple if statement inside Start(), so what else do I need to add before Start(), and within Start()'s if, to draw a line, and up arrow, and down arrow?

Thanks.