setUp Thread Group

A special type of ThreadGroup that can be utilized to perform Pre-Test Actions. The behavior of these threads is exactly like a normal Thread Group element. The difference is that these type of threads execute before the test proceeds to the executing of regular Thread Groups.

Basically, you have to put those requests which you want to run before the main test starts. Refer below sample script :

https://www.dropbox.com/sh/c0utecr4t87ez7v/2m4OIULEkV