I feel dumb but i've been searching all over the forums and I can't seem to find anything on this topic. I need help making one and don't even know where to start as im a beginner to this. Maybe one of you could help me?
The simple way

More complex ways
Sajal's advice Shuffle Lists & Unique Random Numbers
Taifun's advice * How to pick a random item from a list without picking duplicates?
Here are some resources to help you learn to use the AI2 tools. A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook App Inventor 2 Book: Create Your Own Android Apps ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
There is a free programming course here Course In A Box and the aia files for the projects in the book are here: App Inventor 2 Book: Create Your Own Android Apps
How to do a lot of basic things with App Inventor are described here: How do you...? .
Also look here App inventor español. Offline. Tutorial. Ejemplos. Instalación. Códigos. Juegos. Curso gratis de App inventor. and here Tutorials for more tutorials.
Learn about components Component Reference
and visit the Library The MIT App Inventor Library: Documentation & Support Help>Library on the MENU
Thank you, would of never found that block 
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