I have a Macbook with OS X 10.9.5 and I need to go to a 10.11 or above. What is the version I should be upgrading to?

It really depends upon your exact model Macbook and its specifications.

To get more information about your computer, go to the Apple in the upper left corner of any window, then "About This Mac", then "More Info..." Copy and paste the information here, but omit the serial number and Hardware UUID (if present).

Upgrade to OS X El Capitan - https://support.apple.com/HT206886 - "OS X El Capitan remains available for Mac computers that can't upgrade to macOS High Sierra, or that need to upgrade to El Capitan first." The El Capitan link will not work on a computer running 10.8.5 or newer and capable of High Sierra.