I want to present the questions of my Quiz/Worksheet in a random order, but I need to keep an intro at the front
You can configure your quiz to present the questions in random order by enabling General > Question order and numbering > Random question order.
When this is enabled, all Info questions will remain in place, while the Question sections are randomized. Questions will never move beyond Info sections.
This behaviour allows you to keep a logical order in your Quiz, even though the questions are in random order.