You are requesting both conditions to be true at the same time on candle ID 0 (the current candle). You should select candle ID 1 on both condition blocks instead.
Once a day means only one tick is passed at the beginning of a day, that is at 00:00
Nothing would happen as the following blocks would not run at your specified time
@tradingconig yes, is correct how you want use the step and trailing. Just define your stop loss on the buy order to exist something to moves on trailing. Also don't forget to put an conditional or pink block to the trailing be activated when the condition happens