How do I make curves on all sides?

Hello, so I'm trying to model a mouse shell to 3d print. I understand how to make a solid shape from the sideview, so the general shape of the mouse, but how would I get the left/right side of the mouse also slanted/curved?

Anyone know of a video demonstrating something like this, I know it's not complex but I've also just opened Fusion360 for the first time today.
(I have used Blender a lot though for general modeling)