If you want to set up a proper functional quest system, this tutorial series might help you out: https://www.youtube.com/watch?v=k2zC9pg6Eno&list=PL4G2bSPE_8umJfOuXxut28OQyIliW2Pfp&index=2&t=0s
It’s a bit long with 13 parts, but he generally does a good job of explaining the reasoning behind the procedures.