How would I be able to reward money on death?

I'm building a game with my friends and I'm trying to get a script that rewards money when you die.

I have tried one of those Money on Death free models but it doesn't work as it thinks that if I kill a zombie it will give me 5 cash (which I want the humanoid on death to give 10 cash). and not a death of a non-existent zombie.

Judging by how you said you have no idea how to reassign variables, I'm going to assume you have no idea how to script, and because this is not a request site, we can't tell you how to script it.

However, what I can do is point you towards these sources that will teach you how to techniques you can use to figure out how to solve your problem:

https://developer.roblox.com/videos/Intro-to-Scripting-Create-Scripts

https://www.lua.org/manual/5.3/manual.html

If this helps you, then mark it as the correct answer.