Got any advice on how to lay out a design for Flutter? I'm a back end dev mostly, but I'd like to have a go at making a small mobile app. My sticking point is b

Got any advice on how to lay out a design for Flutter? I'm a back end dev mostly, but I'd like to have a go at making a small mobile app. My sticking point is building the interface. Doing it all in code without a layout design tool to help feels pretty agricultural.