I'm a beginner. I just want to add a generic sphere/cube or something to my scene but I can't find the exact menu for this? Literally googled "how to add an object to a scene in Blender" and couldn't find anything.
ShiftA Mesh > UV Sphere
3D View header Add > Mesh > UV Sphere
Toolshelf in the 3D View Create tab then the UV Sphere button.
And those are just the normal simple ways to add a sphere.
This question probably could be of some help, at least you'll have a cube...