First problem use an switch, at the last part of the command line make a switch and assign a name, then make a second page and under the conditions set the switch for it.
To make events immdietaly happen use either of these two,
Auto-Start: The event starts as soon as you enter the map and it prevents other events from moving or carrying out any commands.
Parallel Process: The event starts as soon as you enter the map and it allows other events to move or carry out any commands.