Get whatever apps that you had installed on the iPhone. Obviously the Apple apps won't be available such as iMessage.
As for setting up, make an iPhone backup in iTunes. If you have a Mac, install Samsung Smartswitch from the Samsung site. When you get the S7 Edge, start Smartswitch and connect the Edge to the computer. Smartswitch will prompt you to restore your iTunes backup to the Edge.
Don't get rid of the iPhone yet in case you feel like going back.