Hi Kai,
Welcome!
It won’t harm to learn a little bit about Modeling at least (Fundamentals of Modeling). You obviously don’t have to become an expert modeler, but sometimes you’ll need to change something on the models you get, so some basic knowledge is good. Also, compared to the time you’ll spend learning Rigging and Animating, it’ll be a really small investment.
But it’s up to you, you can also immediately dive into Animation and Rigging and only start learning Modeling basics, when the need occurs.
