All of your stylus-based tool on the Note 5 are easily accessible via the Air Command popup, which is triggered with the pen button. This year you've got several new options to explore here, not least of which are configurable shortcuts finally. You can now change what apps are linked in the Air Command UI, so if you want to have Keep or Evernote in there instead of S Note, you can do that. You have six shortcuts here, three of which are configurable.
You can also open the Air Command settings and control whether or not Air Command remains accessible via a floating icon and if it opens automatically when you remove the S pen from its holder. Personally, I think "off" is the best setting for both of these.