- Copy the Settings User file
- Copy the Key Binding - User
- Install the Packet Control plugin manager from here using the git method (press Control+Shift+P, type install to see if this has been properly installed)
- Not all packages are yet compatible with ST3, here is a more verbose list https://github.com/wbond/sublime_package_control/wiki/Sublime-Text-3-Compatible-Packages
At first glance it was easy to copy the basic settings. There are some compatibility issues with the modules although.