What kind of belt should be worn with what kind of clothing?

The wider variety of belts in baser colors, black, brown, white can be worn with more or less every outfit, whether it’s for long tops or dressed. The skinny ones on the other hand look better with clothing with a leaner cut.

Fridays can be unpredictable. What shoes can I wear to work that go with both the formal/informal look?

For men, Tod's in the darker colors such as browns, blacks and navy are fit for both formal as well as informal evenings, while for women; a pair of wedges that match the outfit could do the trick.

How are we supposed to find the right kind of tie?

Depending on your preference, you can choose that either matches or contrasts your shirt in terms of the shade, the pattern, the print, the material.