To establish connection between your Mac and your iPhone/iPad follow quick in app tour or check more detailed guide here.
Remote for Mac
You can control what devices are allowed to connect to your Mac. When new device tries to connect to your Mac and you have "Require authorization" setting enabled, you will see this dialog, allowing you to allow or deny this device to connect. Check "General Settings" for more information.
Auto-start at login
Enabling this option will add Remote for Mac to your login items thus launching the app at login. It's best option for headless Mac (like Mac mini) to make sure the app is running when you need it.
Stop on Fast User Switching
If you have multiple users on your Mac you might want to consider enabling this option, so when user running the app switches to another user, the app will stop controlling your Mac.
Hide icon on launch
Great option if you don't like clutter in your menu bar, or you just want to prank someone without them knowing how you doing it. To restore the icon - launch the app again, and in the dialog select "Show Application".
If you take your MacBook and use this app on public / office network, you might want to enable this option, to control which devices can control your Mac. Every time new device tries to connect you will have to allow it to control your Mac, from the popover, or using "Devices" tab in this window.
Here you can control which devices are allowed to control your Mac, and also see the last time this device connected to your Mac. You can delete old devices, or deny them access.
Using "Actions" tab you can add custom actions to list of system actions in "Remote Control" app. You can use Apple Script to do pretty much what ever you want - on your own risk. If you write an Apple Script to delete your whole disk, I'm not responsible :)