Follow Macros are one of the easiest macros for you to make and one of the most essential for boxing. Use my macro below as a reference for making your own. The first line should consist of /pause 5, /target <YourMainCharsName> then the second line is universal and should say /follow.
I recommend you make one of these macros for every single one of your characters except your tank. Bind them to a key that's somewhat out of the way but still frequently going to be hit.