Right click to select stuff.
S to scale objects.
R to rotate objects.
Tab to switch between edit mode and object mode.
G to grab objects and move them.
E to extrude faces & vertices.
When grabbing, scaling, and rotating, you can press
X,
Y, or
Z to follow that axis. You can also type in a value that will scale/rotate/move it by that number.
Also use your numpad keys for quick movement around your scene, and I always like to model in ortho view, press
Numpad 5 to toggle it, you should find it handy.
Also, EXTRUDE EXTRUDE and more EXTRUDE, having cubes stacked onto each other looks ugly and is harder to do, but a lot of people still do it. *cough*nuketf*cough*
Really, I don't use my mouse for much other than selecting, and even then it is very few clicks, controlling stuff with keybinds is much more efficient and cleaner.